Ally Financial (ALLY) 10-Q 4 Aug 16 2016 Q2 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - USD ($)	6 Months Ended
	Jun. 30, 2016	Aug. 02, 2016	Jun. 30, 2015
Document And Entity Information [Abstract]
Entity Registrant Name	Ally Financial Inc.
Entity Central Index Key	40,729
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Jun. 30, 2016
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Common Stock, Shares Outstanding		483,657,867
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 9,874,447,499

Consolidated Statement of Incom

Consolidated Statement of Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Financing Revenue and Other Interest Income [Abstract]
Interest and fees on finance receivables and loans	$ 1,265	$ 1,118	$ 2,500	$ 2,192
Interest on loans held-for-sale	0	14	0	38
Interest and dividends on investment securities	99	93	201	181
Interest on cash and cash equivalents	4	2	7	4
Operating leases	701	860	1,470	1,756
Total financing revenue and other interest income	2,069	2,087	4,178	4,171
Interest Expense [Abstract]
Interest on deposits	203	177	396	349
Interest on short-term borrowings	12	12	25	23
Interest on long-term debt	436	419	878	848
Total interest expense	651	608	1,299	1,220
Depreciation expense on operating lease assets	434	563	944	1,185
Net financing revenue (loss)	984	916	1,935	1,766
Other revenue [Abstract]
Servicing fees	18	10	31	20
Insurance premiums and service revenue earned	236	237	466	470
Gain (loss) on mortgage and automotive loans, net	3	1	4	47
Loss on extinguishment of debt	0	(156)	(4)	(354)
Other gain on investments, net	39	45	93	100
Other income, net of losses	96	84	191	191
Total other revenue	374	211	750	454
Total net revenue (loss)	1,358	1,127	2,685	2,220
Provision for loan losses	172	140	392	256
Noninterest Expense [Abstract]
Compensation and benefits expense	242	236	494	491
Insurance losses and loss adjustment expenses	145	122	218	178
Other operating expenses	386	366	771	750
Total noninterest expense	773	724	1,483	1,419
Income (loss) from continuing operations before income tax expense	413	263	810	545
Income tax expense (benefit) from continuing operations	56	94	206	197
Net income (loss) from continuing operations	357	169	604	348
Income (loss) from discontinued operations, net of tax	3	13	6	410
Net income (loss)	360	182	610	758
Other Comprehensive Income (Loss), Net of Tax	120	(148)	266	(117)
Comprehensive income	$ 480	$ 34	$ 876	$ 641
Earnings Per Share, Basic [Abstract]
Net income from continuing operations	$ 0.70	$ (2.24)	$ 1.18	$ (2.01)
Income from discontinued operations, net of tax	0.01	0.03	0.01	0.85
Net income	0.71	(2.22)	1.20	(1.16)
Earnings Per Share, Diluted [Abstract]
Net income from continuing operations	0.70	(2.24)	1.18	(2.01)
Income from discontinued operations, net of tax	0.01	0.03	0.01	0.85
Net income	$ 0.71	$ (2.22)	$ 1.19	$ (1.16)

Consolidated Balance Sheet

Consolidated Balance Sheet - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Assets [Abstract]
Noninterest-bearing cash and cash equivalents	$ 1,790	$ 2,148
Interest-bearing cash and cash equivalents	3,941	4,232
Total cash and cash equivalents	5,731	6,380
Available-for-sale securities	18,197	17,157
Held-to-maturity securities	571	0
Loans held-for-sale, net	15	105
Finance receivables and loans, net [Abstract]
Finance receivables and loans, net	112,653	111,600
Allowance for loan losses	(1,089)	(1,054)
Total finance receivables and loans, net	111,564	110,546
Investment in operating leases, net	13,755	16,271
Premiums receivable and other insurance assets	1,844	1,801
Other assets	6,254	6,321
Total assets	157,931	158,581
Liabilities and Equity [Abstract]
Noninterest-bearing deposit liabilities	94	89
Interest-bearing deposit liabilities	72,708	66,389
Total deposit liabilities	72,802	66,478
Short-term borrowings	5,994	8,101
Long-term debt	61,040	66,234
Interest payable	427	350
Unearned insurance premiums and service revenue	2,465	2,434
Accrued expenses and other liabilities	1,592	1,545
Total liabilities	144,320	145,142
Equity [Abstract]
Common stock and paid-in-capital	21,136	21,100
Preferred stock	0	696
Accumulated deficit	(7,530)	(8,110)
Accumulated other comprehensive loss	35	(231)
Treasury stock, at cost	(30)	(16)
Total equity	13,611	13,439
Total liabilities and equity	157,931	158,581
Variable Interest Entity, Primary Beneficiary [Member]
Finance receivables and loans, net [Abstract]
Finance receivables and loans, net	26,104	27,929
Allowance for loan losses	(190)	(196)
Total finance receivables and loans, net	25,914	27,733
Investment in operating leases, net	3,257	4,791
Other assets	1,203	1,624
Total assets	30,374	34,148
Liabilities and Equity [Abstract]
Long-term debt	16,783	20,267
Accrued expenses and other liabilities	18	22
Total liabilities	$ 16,801	$ 20,289

Consolidated Balance Sheet (Par

Consolidated Balance Sheet (Paranthetical) - $ / shares	Jun. 30, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Common Stock, Shares Authorized	1,100,000,000	1,100,000,000
Common Stock, Shares, Issued	485,417,677	482,790,696
Common Stock, Shares, Outstanding	483,753,360	481,980,111
Treasury Stock, Shares	1,664,317	810,585

Consolidated Statement Of Chang

Consolidated Statement Of Changes In Equity - USD ($) $ in Millions	Total	Common stock and paid-in capital [Member]	Preferred stock [Member]	Accumulated deficit [Member]	Accumulated other comprehensive (loss) income [Member]	Treasury stock [Member]
Balance at at Dec. 31, 2014	$ 15,399	$ 21,038	$ 1,255	$ (6,828)	$ (66)	$ 0
Net income (loss)	758			758
Preferred stock dividends	(1,318)			(1,318)
Stock Repurchased During Period, Value	(325)		(325)
Preferred stock redemption	(117)		(117)
Share-based compensation	31	31
Other comprehensive income	(117)				(117)
Share repurchases related to employee stock-based compensation awards	(16)					(16)
Balance at at Jun. 30, 2015	14,295	21,069	813	(7,388)	(183)	(16)
Stock Repurchase and Redemption Premium	1,193
Balance at at Dec. 31, 2015	13,439	21,100	696	(8,110)	(231)	(16)
Net income (loss)	610			610
Preferred stock dividends	(30)			(30)
Stock Repurchased During Period, Value	696		696
Share-based compensation	36	36
Other comprehensive income	266				266
Share repurchases related to employee stock-based compensation awards	(14)					(14)
Balance at at Jun. 30, 2016	$ 13,611	$ 21,136	$ 0	$ (7,530)	$ 35	$ (30)

Consolidated Statement Of Cash

Consolidated Statement Of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net income (loss)	$ 610	$ 758
Depreciation and amortization	1,241	1,466
Provision for loan losses	392	256
Gain on mortgage and automotive loans, net	(4)	(47)
Other gain on investments, net	(93)	(100)
Loss on extinguishment of debt	4	354
Originations and purchases of loans held-for-sale	(44)	(1,528)
Proceeds from sales and repayments of loans originated as held-for-sale	144	496
Gain on sale of subsidiaries, net	0	(452)
Deferred income taxes	193	258
Interest payable	76	(59)
Other assets	17	532
Other liabilities	(55)	(217)
Other, net	(59)	26
Net cash provided by (used in) operating activities	2,422	1,743
Net Cash Provided by Investing Activities [Abstract]
Purchases of available-for-sale securities	(8,657)	(8,165)
Proceeds from sales of available-for-sale securities	6,584	2,865
Proceeds from maturities and repayment of available-for-sale securities	1,536	2,192
Purchases of held-to-maturity securities	(571)	0
Net (increase) decrease in finance receivables and loans	(5,653)	(5,471)
Proceeds from sales of finance receivables and loans originated as held-for-investment	4,156	1,582
Purchases of operating lease assets	(1,472)	(2,348)
Disposals of operating lease assets	3,047	2,709
Payments to Acquire Interest in Subsidiaries and Affiliates	(288)	0
Proceeds from sale of business units, net	0	1,049
Increase (Decrease) in Restricted Cash	482	449
Net change in nonmarketable equity investments	(354)	88
Other, net	(69)	(142)
Net cash provided by investing activities	(1,259)	(5,192)
Net Cash Provided by (Used in) Financing Activities [Abstract]
Net change in short-term borrowings	(2,112)	2,945
Net increase in bank deposits	6,308	3,713
Proceeds from issuance of long-term debt	9,020	17,818
Repayments of long-term debt	(14,305)	(18,984)
Repurchase and Redemption of Preferred Stock	(696)	(442)
Dividends paid on preferred stock	(30)	(1,318)
Net cash (used in) provided by financing activities	(1,815)	3,732
Effect of exchange-rate changes on cash and cash equivalents	3	(1)
Net (decrease) increase in cash and cash equivalents	(649)	282
Cash and cash equivalents at beginning of period	6,380	5,576
Cash and cash equivalents at end of period	5,731	5,858
Supplemental Cash Flow Information [Abstract]
Interest	1,234	1,250
Income taxes	12	97
Finance receivables and loans transferred to loans held-for-sale	4,174	72
Proceeds from sales and repayments of mortgage loans held-for-investment originally designated as held-for-sale	$ 18	$ 54

Description Of Business, Basis

Description Of Business, Basis Of Presentation, And Changes In Significant Accounting Policies	6 Months Ended
	Jun. 30, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block]	Description of Business, Basis of Presentation, and Changes in Significant Accounting Policies Ally Financial Inc. (referred to herein as Ally, Parent, we, our, or us) is a leading digital financial services company offering financial products for consumers, businesses, automotive dealers and corporate clients . Founded in 1919, we are a leading financial services company with over 95 years of experience providing a broad array of financial products and services. We operate as a financial holding company (FHC) and a bank holding company (BHC). Our banking subsidiary, Ally Bank, is an award-winning online bank, and an indirect, wholly-owned subsidiary of Ally Financial Inc. with a distinct brand and focus on customers, offering a variety of deposit and other banking products. Our accounting and reporting policies conform to accounting principles generally accepted in the United States of America (GAAP). Additionally, where applicable, the policies conform to the accounting and reporting guidelines prescribed by bank regulatory authorities. The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and that affect income and expenses during the reporting period and related disclosures. In developing the estimates and assumptions, management uses all available evidence; however, actual results could differ because of uncertainties associated with estimating the amounts, timing, and likelihood of possible outcomes. The Condensed Consolidated Financial Statements at June 30, 2016 , and for the three months and six months ended June 30, 2016 , and 2015 , are unaudited but reflect all adjustments that are, in management’s opinion, necessary for the fair presentation of the results for the interim periods presented. All such adjustments are of a normal recurring nature. These unaudited Condensed Consolidated Financial Statements should be read in conjunction with the audited Consolidated Financial Statements (and the related Notes) included in our Annual Report on Form 10-K for the year ended December 31, 2015 , as filed on February 24, 2016 , with the U.S. Securities and Exchange Commission (SEC), as amended by the Current Report on Form 8-K filed with the SEC on May 5, 2016 (referred to herein as the Annual Consolidated Financial Statements). Change in Reportable Segments As a result of a change in how management views and operates our business, during the first quarter of 2016, we made changes in the composition of our operating segments. Financial information related to our Corporate Finance business is presented as a separate reportable segment. Previously, all such activity was included in Corporate and Other. Additionally, only the activity of our ongoing bulk acquisitions of mortgage loans and other originations and refinancing is presented in Mortgage Finance operations. The activity related to the management of our legacy mortgage portfolio is included in Corporate and Other. Our other operating segments, Automotive Finance operations and Insurance operations, were unchanged. Amounts for 2015 have been adjusted to conform to the current management view. In connection with the change in operating segments, we defined additional classes of finance receivables and loans: Mortgage Finance and Mortgage — Legacy. Mortgage Finance includes consumer mortgage loans from our ongoing mortgage operations and Mortgage — Legacy includes consumer mortgage loans originated prior to 2009. Significant Accounting Policies Business Combinations We account for our business acquisitions using the acquisition method of accounting. Under this method we generally record the initial carrying values of purchased assets, including identifiable intangible assets, and assumed liabilities at fair value on the acquisition date. We recognize goodwill when the acquisition price is greater than the fair value of the net assets acquired, including identifiable intangible assets. The initial fair value of recognized assets and liabilities are subject to refinement during the measurement period, a period up to one year after the closing date of an acquisition, as information relative to closing date fair values becomes available. Costs directly related to business combinations are recorded as expenses as they are incurred. Goodwill and Other Intangibles Goodwill and intangible assets, net of accumulated amortization, are reported in other assets. Our intangible assets primarily consist of acquired customer relationships and developed technology, and are amortized using a straight line methodology over their estimated useful lives. We review intangible assets for impairment at least annually, or whenever events or changes in circumstances indicate that the carrying amount of the asset may not be recoverable. If it is determined the carrying amount of the asset is not recoverable, an impairment charge is recorded. Refer to Note 2 for further discussion on intangible assets. Goodwill represents the excess of the cost of an acquisition over the fair value of net assets acquired, including identifiable intangibles. We test goodwill for impairment annually, or more frequently if events and changes in circumstances indicate that it is more likely than not that impairment exists. Our annual goodwill impairment test is performed as of August 31 of each year. Goodwill is reviewed for impairment utilizing a two-step process. The first step of the impairment test requires us to define the reporting units and compare the fair value of each of the reporting units to their respective carrying value. The fair value of the reporting units in our impairment test is determined based on various analyses including discounted cash flow projections using assumptions a market participant would use. If the carrying value is less than the fair value, no impairment exists, and the second step does not need to be completed. If the carrying value is higher than the fair value or there is an indication that impairment may exist, a second step must be performed where we determine the implied value of goodwill based on the individual fair values of the reporting unit's assets and liabilities, including unrecognized intangibles, to compute the amount of the impairment. Refer to Note 2 for further discussion on goodwill. Income Taxes In calculating the provision for interim income taxes, in accordance with Accounting Standards Codification (ASC) 740, Income Taxes , we apply an estimated annual effective tax rate to year-to-date ordinary income. At the end of each interim period, we estimate the effective tax rate expected to be applicable for the full fiscal year. This method differs from that described in Note 1 to the Annual Consolidated Financial Statements, which describes our annual significant income tax accounting policy and related methodology. Investments Our portfolio of investments includes various debt and marketable equity securities and nonmarketable equity investments. Debt and marketable equity securities are classified based on management’s intent to sell or hold the security. We classify debt securities as held-to-maturity only when we have both the intent and ability to hold the securities to maturity. We classify debt and marketable equity securities as trading when the securities are acquired for the purpose of selling or holding them for a short period of time. Securities not classified as either held-to-maturity or trading are classified as available-for-sale. Our debt and marketable equity securities include government securities, corporate bonds, asset-backed securities (ABS), mortgage-backed securities (MBS), equity securities and other investments. Our portfolio includes securities classified as available-for-sale and held-to-maturity. Our available-for-sale securities are carried at fair value with unrealized gains and losses included in accumulated other comprehensive income or loss and are subject to impairment. Our held-to-maturity securities are carried at amortized cost and are subject to impairment. We amortize premiums and discounts on debt securities as an adjustment to investment yield generally over the stated maturity of the security. For ABS and MBS where prepayments can be reasonably estimated, amortization is adjusted for expected prepayments. Additionally, we assess our debt and marketable equity securities for potential other-than-temporary impairment. We employ a methodology that considers available evidence in evaluating potential other-than-temporary impairment of our debt and marketable equity securities classified as available-for-sale and held-to-maturity. If the cost of an investment exceeds its fair value, we evaluate, among other factors, the magnitude and duration of the decline in fair value. We also evaluate the financial health of and business outlook for the issuer, the performance of the underlying assets for interests in securitized assets, and, for securities classified as available-for-sale, our intent and ability to hold the investment through recovery of its amortized cost basis. Once a decline in fair value of a debt security is determined to be other-than-temporary, an impairment charge for the credit component is recorded to other gain (loss) on investments, net, in our Consolidated Statement of Income, and a new cost basis in the investment is established. Noncredit component losses of a debt security are recorded in other comprehensive income (loss) when we do not intend to sell the security and it is not more likely than not that we will have to sell the security prior to the security's anticipated recovery. Unrealized losses that we have determined to be other-than-temporary on equity securities are recorded to other gain (loss) on investments, net in our Consolidated Statement of Income. Subsequent increases and decreases to the fair value of available-for-sale debt and equity securities are included in other comprehensive income (loss), so long as they are not attributable to another other-than-temporary impairment. Realized gains and losses on investment securities are reported in other gain (loss) on investments, net, and are determined using the specific identification method. For information on our debt and marketable equity securities, refer to Note 6 . In addition to our investments in debt and marketable equity securities, we hold equity positions in other entities. These positions include Federal Home Loan Bank (FHLB) and Federal Reserve Bank (FRB) stock held to meet regulatory requirements, other equity investments that are not publicly traded and do not have a readily determinable fair value, equity investments in low income housing tax credits, and Community Reinvestment Act (CRA) equity investments. Our investments in FHLB and FRB stock and other equity investments are accounted for using the cost method of accounting. Our low income housing tax credit investments are accounted for using the proportionate amortization method of accounting for qualified affordable housing investments. Our CRA investments are accounted for using the equity method of accounting. Our FHLB and FRB stock and other equity investments carried at cost are included in nonmarketable equity investments in other assets. Our investments in low income housing tax credits and CRA are also included in other assets. As conditions warrant, we review our investments carried at cost for impairment and will adjust the carrying value of the investment if it is deemed to be impaired. No impairment was recognized in 2016 or 2015. For more information on our nonmarketable equity investments, refer to Note 22 . Refer to Note 1 to the Annual Consolidated Financial Statements regarding additional significant accounting policies. Recently Adopted Accounting Standards Consolidation — Amendments to the Consolidation Analysis (ASU 2015-02) As of January 1, 2016, we adopted ASU (Accounting Standards Update) 2015-02. The amendments in this update modify the requirements of consolidation with respect to entities that are or are similar in nature to limited partnerships or are variable interest entities (VIEs). For entities that are or are similar to limited partnerships, the guidance clarifies the evaluation of kick-out rights, removes the presumption that the general partner will consolidate and generally states that such entities will be presumed to be VIEs unless proven otherwise. For VIEs, the guidance modifies the analysis related to the evaluation of servicing fees, excludes servicing fees that are deemed commensurate with the level of service required from the determination of the primary beneficiary and clarifies certain considerations related to the consolidation analysis when performing a related party assessment. The amendments in this guidance did not impact our historical VIE and consolidation conclusions. No adjustments to our consolidated financial statements were required as a result of the adoption of this guidance. Recently Issued Accounting Standards Revenue from Contracts with Customers (ASU 2014-09) and Revenue from Contracts with Customers — Deferral of the Effective Date (ASU 2015-14) In May 2014, the Financial Accounting Standards Board (FASB) issued ASU 2014-09. The purpose of this guidance is to streamline and consolidate existing revenue recognition principles in GAAP and to converge revenue recognition principles with International Financial Reporting Standards (IFRS). The core principle of the amendments is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled to receive in exchange for those goods or services. The amendments include a five step process for consideration of the main principle, guidance on the accounting treatment for costs associated with a contract, and disclosure requirements related to the revenue process. As originally issued, the amendments in ASU 2014-09 were to be effective beginning on January 1, 2017. However, in August 2015, the FASB issued ASU 2015-14, which deferred the effective date of the guidance until January 1, 2018, and permitted early adoption as of the original effective date in ASU 2014-09. The FASB created a transition resource group to work with stakeholders and clarify the new guidance as necessary. The FASB has issued and is anticipating issuing additional ASUs to provide clarifying guidance and implementation support for ASU 2014-09. Management will consider these additional ASUs when assessing the overall impact of ASU 2014-09. The amendments to the revenue recognition principles can be applied on adoption either through a full retrospective application or on a modified basis with a cumulative effect adjustment on the date of initial adoption with certain practical expedients. Management has determined certain contractual arrangements that are in scope of this guidance and are in the process of completing a scoping assessment in order to determine the impact of the adoption of this guidance. Financial Instruments — Recognition and Measurement of Financial Assets (ASU 2016-01) In January 2016, the FASB issued ASU 2016-01. The amendments in this update modify the requirements related to the measurement of certain financial instruments in the statement of financial condition and results of operation. For equity investments (other than investments accounted for using the equity method), entities must measure such instruments at fair value with changes in fair value recognized in net income. Changes in fair value for available-for-sale equity securities will no longer be recognized through other comprehensive income. Reporting entities may continue to elect to measure equity investments which do not have a readily determinable fair value at cost with adjustments for impairment and observable changes in price. In addition, for a liability (other than a derivative liability) that an entity measures at fair value, any change in fair value related to the instrument-specific credit risk, that is the entity’s own-credit, should be presented separately in other comprehensive income and not as a component of net income. The amendments are effective on January 1, 2018, with early adoption permitted solely for the provisions pertaining to instrument-specific credit risk for liabilities measured at fair value. The amendments must be applied on a modified retrospective basis with a cumulative effect adjustment as of the beginning of the fiscal year of initial adoption. Management is currently evaluating the impact of the amendments. However, we do expect additional volatility in our consolidated results of operations as a result of the requirement to measure equity investments at fair value with changes in the fair value recognized in net income upon adoption. Leases (ASU 2016-02) In February 2016, the FASB issued ASU 2016-02. The amendments in this update primarily replace the existing accounting requirements for operating leases for lessees. Lessee accounting requirements for finance leases and lessor accounting requirements for both operating leases and sales type and direct financing leases (both of which were previously referred to as capital leases) are largely unchanged. The amendments require the lessee of an operating lease to record a balance sheet gross-up upon lease commencement by recognizing a right-to-use asset and lease liability equal to the present value of the lease payments. The right-to-use asset and lease liability should be derecognized in a manner which effectively yields a straight line lease expense over the lease term. In addition to the changes to lessee operating lease accounting, the amendments require additional disclosures for all lease types for both lessees and lessors. The amendments are effective on January 1, 2019, with early adoption permitted. The amendments must be applied on a modified retrospective basis with a cumulative adjustment to the beginning of the earliest fiscal year presented in the financial statements in the period of adoption. Management is currently evaluating the impact of these amendments. Preliminarily, we expect to record a gross up in our consolidated statement of financial position upon adoption reflecting our right-to-use asset and lease liability for our operating leases where we are the lessee (for example, our facility leases). We are currently evaluating the impact of the gross up for our operating leases where we are the lessee. We do not believe the amendments will have a material impact to leases where we are the lessor. Stock Compensation — Improvements to Employee Share-Based Payment Accounting (ASU 2016-09) In March 2016, the FASB issued ASU 2016-09. The amendments in this update include changes to several aspects of share-based payment accounting. The amendments allow for an entity wide accounting policy election to either account for forfeitures as they occur or estimate the number of awards that are expected to vest. The amendments modify the tax withholding requirements to allow entities to withhold an amount up to the employee’s maximum individual statutory tax rates without resulting in a liability classification of the award as opposed to limiting the withholding to the minimum statutory tax rates. The amendments require that all excess tax benefits and tax deficiencies related to share-based payment awards should be recognized in income tax expense or benefit in the income statement in the period in which they occur. The amendments also address the classification and presentation of certain items on the cash flow statement. The amendments are effective on January 1, 2017, with early adoption permitted. The transition method varies depending on the specific amendment. Management is currently evaluating the impact of these amendments. Financial Instruments — Credit Losses (ASU 2016-13) In June 2016, the FASB issued ASU 2016-13. The amendments in this update introduce a new accounting model to measure credit losses for financial assets measured at amortized cost. Credit losses for financial assets measured at amortized cost should be determined based on the total current expected credit losses over the life of the financial asset or group of financial assets. In effect, the financial asset or group of financial assets should be presented at the net amount expected to be collected. Credit losses will no longer be measured as they are incurred for financial assets measured at amortized cost. The amendments also modify the accounting for available-for-sale debt securities whereby credit losses will be recorded through an allowance for credit losses rather than a write-down to the security’s cost basis, which allows for reversals of credit losses when estimated credit losses decline. Credit losses for available-for-sale debt securities should be measured in a manner similar to current GAAP. The amendments are effective on January 1, 2020, with early adoption permitted as of January 1, 2019. The amendments must be applied using a modified retrospective approach with a cumulative-effect adjustment through retained earnings as of the beginning of the fiscal year upon adoption. The new accounting model for credit losses represents a significant departure from existing GAAP, which will increase the allowance for credit losses with a resulting negative adjustment to retained earnings. Management is currently evaluating the impact of the amendments.

Acquisition of Trade King Acqui

Acquisition of Trade King Acquisition of Trade King	6 Months Ended
	Jun. 30, 2016
Business Combinations [Abstract]
Business Combination Disclosure [Text Block]	Acquisition of TradeKing On June 1, 2016 , we acquired 100% of the equity of TradeKing Group, Inc. (TradeKing), a digital wealth management company with an online broker/dealer, digital portfolio management platform, and educational content and social collaboration channels , for $298 million in cash. TradeKing will operate as a wholly owned subsidiary of Ally. The addition of brokerage and wealth management is a natural extension of our online banking franchise, creating a full suite of financial products for savings and investments. We applied the acquisition method of accounting to this transaction, which generally requires the initial recognition of assets acquired, including identifiable intangible assets, and liabilities assumed at their respective fair value. Goodwill is recognized as the excess of the acquisition price after the recognition of the net assets, including the identifiable intangible assets. Financial information related to TradeKing for June 2016 is included within Corporate and Other . The following table summarizes the allocation of cash consideration paid for TradeKing and the amounts of the identifiable assets acquired and liabilities assumed recognized at the acquisition date. ($ in millions) Purchase price Cash consideration $ 298 Allocation of purchase price to net assets acquired Intangible assets 82 Cash and short-term investments (a) 50 Other assets 14 Deferred tax asset, net 4 Employee compensation and benefits (41 ) Other liabilities (4 ) Goodwill $ 193 (a) Includes $40 million in cash proceeds from the acquisition transaction in order to pay employee compensation and benefits that vested upon acquisition as a result of the change in control. The goodwill of $193 million arising from the acquisition consists largely of expected growth of the business as we leverage the Ally brand and our marketing capabilities to scale the acquired technology platform and expand the suite of financial products we offer to our existing growing customer base. None of the goodwill recognized is expected to be deductible for income tax purposes. Refer to Note 11 for a reconciliation of the carrying amount of goodwill at the beginning and end of the reporting period.

Discontinued and Held-for-sale

Discontinued and Held-for-sale Operations	6 Months Ended
	Jun. 30, 2016
Discontinued Operations and Disposal Groups [Abstract]
Disposal Groups, Including Discontinued Operations, Disclosure [Text Block]	Discontinued Operations Prior to the adoption of ASU 2014-08, which was prospectively applied only to newly identified disposals that qualify as discontinued operations beginning after January 1, 2015, we have classified operations as discontinued when operations and cash flows will be eliminated from our ongoing operations and we do not expect to retain any significant continuing involvement in their operations after the respective sale or disposal transactions. For all periods presented, the operating results for these discontinued operations have been removed from continuing operations and presented separately as discontinued operations, net of tax, in the Condensed Consolidated Statement of Comprehensive Income . The Notes to the Condensed Consolidated Financial Statements have been adjusted to exclude discontinued operations unless otherwise noted. Select Automotive Finance Operations During the fourth quarter of 2012 we entered into an agreement with General Motors Financial Company Inc. (GMF) to sell our 40% interest in a motor vehicle finance joint venture in China. On January 2, 2015, the sale of our interest in the motor vehicle finance joint venture in China was completed and an after-tax gain of approximately $400 million was recorded. The tax expense included in this gain was reduced by the release of the valuation allowance on our capital loss carryforward deferred tax asset that was utilized to offset capital gains stemming from this sale. The remaining activity relates to previous discontinued operations for which we continue to have minimal residual costs. Other Operations Other operations relate to previous discontinued operations for which we continue to have minimal residual costs. Select Financial Information Select financial information of discontinued operations is summarized below. The pretax income or loss includes direct costs to transact a sale. Three months ended June 30, Six months ended June 30, ($ in millions) 2016 2015 2016 2015 Select Automotive Finance operations Pretax (loss) income (a) $ (1 ) $ (5 ) $ — $ 453 Tax expense (b) — — — 65 Other operations Pretax (loss) income $ (1 ) $ 18 $ 2 $ 20 Tax benefit (5 ) — (4 ) (2 ) (a) Includes certain treasury and other corporate activity recognized by Corporate and Other. (b) Includes certain income tax activity recognized by Corporate and Other.

Other Income, Net Of Losses

Other Income, Net Of Losses	6 Months Ended
	Jun. 30, 2016
Other Nonoperating Income (Expense) [Abstract]
Other Income, Net of Losses [Text Block]	Other Income, Net of Losses Details of other income, net of losses, were as follows. Three months ended June 30, Six months ended June 30, ($ in millions) 2016 2015 2016 2015 Remarketing fees $ 25 $ 25 $ 53 $ 53 Late charges and other administrative fees 22 21 47 43 Servicing fees 18 10 31 20 Income from equity-method investments 5 4 11 37 Other, net 26 24 49 38 Total other income, net of losses $ 96 $ 84 $ 191 $ 191

Other Operating Expenses

Other Operating Expenses	6 Months Ended
	Jun. 30, 2016
Operating Expenses [Abstract]
Other Operating Expenses [Text Block]	Other Operating Expenses Details of other operating expenses were as follows. Three months ended June 30, Six months ended June 30, ($ in millions) 2016 2015 2016 2015 Insurance commissions $ 97 $ 95 $ 191 $ 188 Technology and communications 67 64 133 133 Lease and loan administration 34 32 66 61 Professional services 26 25 50 45 Advertising and marketing 21 23 48 54 Vehicle remarketing and repossession 22 18 46 37 Premises and equipment depreciation 21 22 42 42 Regulatory and licensing fees 21 20 42 41 Occupancy 12 13 25 24 Non-income taxes 8 7 17 15 Other 57 47 111 110 Total other operating expenses $ 386 $ 366 $ 771 $ 750

Investment Securities

Investment Securities	6 Months Ended
	Jun. 30, 2016
Investments, Debt and Equity Securities [Abstract]
Investment Securities [Text Block]	Investment Securities Our portfolio of securities includes bonds, equity securities, asset- and mortgage-backed securities, and other investments. The cost, fair value, and gross unrealized gains and losses on investment securities were as follows. June 30, 2016 December 31, 2015 Amortized cost Gross unrealized Fair value Amortized cost Gross unrealized Fair value ($ in millions) gains losses gains losses Available-for-sale securities Debt securities U.S. Treasury and federal agencies $ 265 $ 10 $ — $ 275 $ 1,760 $ — $ (19 ) $ 1,741 U.S. States and political subdivisions 701 33 (1 ) 733 693 24 (1 ) 716 Foreign government 180 11 — 191 169 8 — 177 Mortgage-backed residential (a) 12,446 199 (28 ) 12,617 10,459 52 (145 ) 10,366 Mortgage-backed commercial 513 1 (8 ) 506 486 — (5 ) 481 Asset-backed 1,671 6 (3 ) 1,674 1,762 1 (8 ) 1,755 Corporate debt 1,566 39 (3 ) 1,602 1,213 8 (17 ) 1,204 Total debt securities (b) (c) 17,342 299 (43 ) 17,598 16,542 93 (195 ) 16,440 Equity securities 675 6 (82 ) 599 808 3 (94 ) 717 Total available-for-sale securities $ 18,017 $ 305 $ (125 ) $ 18,197 $ 17,350 $ 96 $ (289 ) $ 17,157 Total held-to-maturity securities (d) $ 571 $ 9 $ (1 ) $ 579 $ — $ — $ — $ — (a) Residential mortgage-backed securities include agency-backed bonds totaling $9,997 million and $7,544 million at June 30, 2016 , and December 31, 2015 , respectively. (b) Certain entities related to our Insurance operations are required to deposit securities with state regulatory authorities. These deposited securities totaled $15 million and $14 million at June 30, 2016 , and December 31, 2015 . (c) Investment securities with a fair value of $492 million and $2,506 million at June 30, 2016 , and December 31, 2015 , were pledged to secure advances from the FHLB, short-term borrowings or repurchase agreements and for other purposes as required by contractual obligation or law. Under these agreements, Ally has granted the counterparty the right to sell or pledge $492 million and $745 million of the underlying investment securities at June 30, 2016 , and December 31, 2015 , respectively. (d) Held-to-maturity securities are recorded at amortized cost and consist of agency-backed residential mortgage-backed debt securities for liquidity purposes. The maturity distribution of investment securities outstanding is summarized in the following tables. Call or prepayment options may cause actual maturities to differ from contractual maturities. Total Due in one year or less Due after one year through five years Due after five years through ten years Due after ten years ($ in millions) Amount Yield Amount Yield Amount Yield Amount Yield Amount Yield June 30, 2016 Fair value of available-for-sale debt securities (a) U.S. Treasury and federal agencies $ 275 1.8 % $ 2 4.2 % $ 61 1.5 % $ 212 1.9 % $ — — % U.S. States and political subdivisions 733 3.1 127 2.4 31 1.9 123 3.0 452 3.4 Foreign government 191 2.7 9 2.5 85 2.9 97 2.5 — — Mortgage-backed residential 12,617 2.9 — — 1 4.5 28 2.5 12,588 2.9 Mortgage-backed commercial 506 2.3 — — — — 3 2.8 503 2.3 Asset-backed 1,674 2.7 — — 992 2.5 444 3.2 238 2.4 Corporate debt 1,602 2.9 73 2.7 919 2.6 575 3.3 35 5.1 Total available-for-sale debt securities $ 17,598 2.9 $ 211 2.5 $ 2,089 2.5 $ 1,482 3.0 $ 13,816 2.9 Amortized cost of available-for-sale debt securities $ 17,342 $ 211 $ 2,066 $ 1,439 $ 13,626 Amortized cost of held-to-maturity securities $ 571 2.9 % $ — — % $ — — % $ — — % $ 571 2.9 % December 31, 2015 Fair value of available-for-sale debt securities (a) U.S. Treasury and federal agencies $ 1,741 1.8 % $ 6 5.1 % $ 510 1.2 % $ 1,225 2.1 % $ — — % U.S. States and political subdivisions 716 3.2 86 1.3 37 2.2 141 2.8 452 3.7 Foreign government 177 2.6 9 1.9 77 2.8 91 2.6 — — Mortgage-backed residential 10,366 2.9 — — 33 2.1 36 2.5 10,297 2.9 Mortgage-backed commercial 481 2.0 — — — — 3 2.7 478 2.0 Asset-backed 1,755 2.3 6 1.4 1,027 2.1 518 2.6 204 2.2 Corporate debt 1,204 2.9 50 3.0 713 2.5 410 3.4 31 5.4 Total available-for-sale debt securities $ 16,440 2.7 $ 157 2.0 $ 2,397 2.1 $ 2,424 2.5 $ 11,462 2.9 Amortized cost of available-for-sale debt securities $ 16,542 $ 156 $ 2,404 $ 2,436 $ 11,546 (a) Yield is calculated using the effective yield of each security at the end of the period, weighted based on the market value. The effective yield considers the contractual coupon and amortized cost, and excludes expected capital gains and losses. The balances of cash equivalents were $0.9 billion and $1.0 billion at June 30, 2016 , and December 31, 2015 , respectively, and were composed primarily of money market accounts and short-term securities, including U.S. Treasury bills. The following table presents interest and dividends on investment securities. Three months ended June 30, Six months ended June 30, ($ in millions) 2016 2015 2016 2015 Taxable interest $ 89 $ 82 $ 183 $ 162 Taxable dividends 5 6 9 11 Interest and dividends exempt from U.S. federal income tax 5 5 9 8 Interest and dividends on investment securities $ 99 $ 93 $ 201 $ 181 The following table presents gross gains and losses realized upon the sales of available-for-sale securities and other-than-temporary impairment. Three months ended June 30, Six months ended June 30, ($ in millions) 2016 2015 2016 2015 Gross realized gains $ 40 $ 46 $ 94 $ 106 Gross realized losses (a) (1 ) — (1 ) (3 ) Other-than-temporary impairment — (1 ) — (3 ) Other gain on investments, net $ 39 $ 45 $ 93 $ 100 (a) Certain available-for-sale securities were sold at a loss in 2016 and 2015 as a result of market conditions within these respective periods (e.g., a downgrade in the rating of a debt security). Any such sales were made in accordance with our risk management policies and practices. The table below summarizes available-for-sale securities in an unrealized loss position in accumulated other comprehensive income. Based on the assessment of whether such losses were deemed to be other than temporary, we believe that the unrealized losses are not indicative of an other-than-temporary impairment of these securities. As of June 30, 2016 , we did not have the intent to sell the debt securities with an unrealized loss position in accumulated other comprehensive income, it is not more likely than not that we will be required to sell these securities before recovery of their amortized cost basis, and we expect to recover the entire amortized cost basis of the securities. As of June 30, 2016 , we had the ability and intent to hold equity securities with an unrealized loss position in accumulated other comprehensive income, and it is not more likely than not that we will be required to sell these securities before recovery of their amortized cost basis. As a result, we believe that the securities with an unrealized loss position in accumulated other comprehensive income are not considered to be other-than-temporarily impaired at June 30, 2016 . Refer to Note 1 for additional information related to investment securities and our methodology for evaluating potential other-than-temporary impairments. June 30, 2016 December 31, 2015 Less than 12 months 12 months or longer Less than 12 months 12 months or longer ($ in millions) Fair value Unrealized loss Fair value Unrealized loss Fair value Unrealized loss Fair value Unrealized loss Available-for-sale securities Debt securities U.S. Treasury and federal agencies $ — $ — $ — $ — $ 1,553 $ (17 ) $ 173 $ (2 ) U.S. States and political subdivisions 169 (1 ) 10 — 179 (1 ) — — Foreign government — — — — 2 — — — Mortgage-backed 676 (6 ) 2,139 (30 ) 4,096 (43 ) 2,453 (107 ) Asset-backed 656 (2 ) 144 (1 ) 1,402 (8 ) 64 — Corporate debt 73 (1 ) 63 (2 ) 745 (16 ) 12 (1 ) Total temporarily impaired debt securities 1,574 (10 ) 2,356 (33 ) 7,977 (85 ) 2,702 (110 ) Temporarily impaired equity securities 268 (37 ) 207 (45 ) 534 (54 ) 96 (40 ) Total temporarily impaired available-for-sale securities $ 1,842 $ (47 ) $ 2,563 $ (78 ) $ 8,511 $ (139 ) $ 2,798 $ (150 )

Finance Receivables And Loans,

Finance Receivables And Loans, Net	6 Months Ended
	Jun. 30, 2016
Loans and Leases Receivable, Net Reported Amount, by Category Alternative [Abstract]
Loans, Notes, Trade and Other Receivables Disclosure [Text Block]	Finance Receivables and Loans, Net The composition of finance receivables and loans reported at gross carrying value was as follows. ( $ in millions ) June 30, 2016 December 31, 2015 Consumer automotive (a) $ 63,281 $ 64,292 Consumer mortgage Mortgage Finance (b) 8,009 6,413 Mortgage — Legacy (c) 3,075 3,360 Total consumer mortgage 11,084 9,773 Total consumer 74,365 74,065 Commercial Commercial and industrial Automotive 31,640 31,469 Other 3,037 2,640 Commercial real estate — Automotive 3,611 3,426 Total commercial 38,288 37,535 Total finance receivables and loans (d) $ 112,653 $ 111,600 (a) Includes $88 million and $66 million of fair value adjustment for loans in hedge accounting relationships at June 30, 2016 , and December 31, 2015 , respectively. Refer to Note 20 for additional information. (b) Includes loans originated as interest-only mortgage loans of $38 million and $44 million at June 30, 2016 , and December 31, 2015 , respectively, 5% of which are expected to start principal amortization in 2016 , 2% in 2017 , none in 2018 , 38% in 2019 , and 38% thereafter. (c) Includes loans originated as interest-only mortgage loans of $830 million and $941 million at June 30, 2016 , and December 31, 2015 , respectively, 22% of which are expected to start principal amortization in 2016 , 22% in 2017 , 2% in 2018 , none in 2019 , and 1% thereafter. (d) Totals include a net increase of $268 million and $110 million at June 30, 2016 , and December 31, 2015 , respectively, for unearned income, unamortized premiums and discounts, and deferred fees and costs. The following tables present an analysis of the activity in the allowance for loan losses on finance receivables and loans. Three months ended June 30, 2016 ($ in millions) Consumer automotive Consumer mortgage Commercial Total Allowance at April 1, 2016 $ 850 $ 115 $ 112 $ 1,077 Charge-offs (227 ) (9 ) (1 ) (237 ) Recoveries 79 5 1 85 Net charge-offs (148 ) (4 ) — (152 ) Provision for loan losses 168 (2 ) 6 172 Other (a) (8 ) — — (8 ) Allowance at June 30, 2016 $ 862 $ 109 $ 118 $ 1,089 (a) Primarily related to the transfer of finance receivables and loans from held-for-investment to held-for-sale. Three months ended June 30, 2015 ( $ in millions ) Consumer automotive Consumer mortgage Commercial Total Allowance at April 1, 2015 $ 711 $ 119 $ 103 $ 933 Charge-offs (166 ) (9 ) — (175 ) Recoveries 70 5 — 75 Net charge-offs (96 ) (4 ) — (100 ) Provision for loan losses 152 3 (15 ) 140 Other — 1 — 1 Allowance at June 30, 2015 $ 767 $ 119 $ 88 $ 974 Six months ended June 30, 2016 ($ in millions) Consumer automotive Consumer mortgage Commercial Total Allowance at January 1, 2016 $ 834 $ 114 $ 106 $ 1,054 Charge-offs (480 ) (19 ) (1 ) (500 ) Recoveries 159 9 1 169 Net charge-offs (321 ) (10 ) — (331 ) Provision for loan losses 375 5 12 392 Other (a) (26 ) — — (26 ) Allowance at June 30, 2016 $ 862 $ 109 $ 118 $ 1,089 Allowance for loan losses at June 30, 2016 Individually evaluated for impairment $ 26 $ 37 $ 23 $ 86 Collectively evaluated for impairment 836 72 95 1,003 Loans acquired with deteriorated credit quality — — — — Finance receivables and loans at gross carrying value Ending balance $ 63,281 $ 11,084 $ 38,288 $ 112,653 Individually evaluated for impairment 348 254 122 724 Collectively evaluated for impairment 62,933 10,830 38,166 111,929 Loans acquired with deteriorated credit quality — — — — (a) Primarily related to the transfer of finance receivables and loans from held-for-investment to held-for-sale. Six months ended June 30, 2015 ($ in millions) Consumer automotive Consumer mortgage Commercial Total Allowance at January 1, 2015 $ 685 $ 152 $ 140 $ 977 Charge-offs (359 ) (31 ) — (390 ) Recoveries 131 8 1 140 Net charge-offs (228 ) (23 ) 1 (250 ) Provision for loan losses 310 (2 ) (52 ) 256 Other (a) — (8 ) (1 ) (9 ) Allowance at June 30, 2015 $ 767 $ 119 $ 88 $ 974 Allowance for loan losses at June 30, 2015 Individually evaluated for impairment $ 22 $ 50 $ 19 $ 91 Collectively evaluated for impairment 745 69 69 883 Loans acquired with deteriorated credit quality — — — — Finance receivables and loans at gross carrying value Ending balance $ 60,786 $ 9,211 $ 35,175 $ 105,172 Individually evaluated for impairment 275 265 99 639 Collectively evaluated for impairment 60,511 8,946 35,076 104,533 Loans acquired with deteriorated credit quality — — — — (a) Primarily related to the transfer of finance receivables and loans from held-for-investment to held-for-sale. The following table presents the gross carrying value of significant sales of finance receivables and loans and transfers of finance receivables and loans from held-for-investment to held-for-sale. Three months ended June 30, Six months ended June 30, ( $ in millions ) 2016 2015 2016 2015 Consumer automotive $ 1,560 $ — $ 4,159 $ — Consumer mortgage 4 4 6 73 Commercial 28 — 28 — Total sales and transfers $ 1,592 $ 4 $ 4,193 $ 73 The following table presents information about significant purchases of finance receivables and loans. Three months ended June 30, Six months ended June 30, ($ in millions) 2016 2015 2016 2015 Consumer automotive $ — $ — $ — $ — Consumer mortgage 1,018 1,996 2,388 2,650 Total purchases of finance receivables and loans $ 1,018 $ 1,996 $ 2,388 $ 2,650 The following table presents an analysis of our past due finance receivables and loans recorded at gross carrying value. ( $ in millions ) 30-59 days past due 60-89 days past due 90 days or more past due Total past due Current Total finance receivables and loans June 30, 2016 Consumer automotive $ 1,438 $ 307 $ 226 $ 1,971 $ 61,310 $ 63,281 Consumer mortgage Mortgage Finance 49 5 8 62 7,947 8,009 Mortgage — Legacy 47 12 62 121 2,954 3,075 Total consumer mortgage 96 17 70 183 10,901 11,084 Total consumer 1,534 324 296 2,154 72,211 74,365 Commercial Commercial and industrial Automotive — — — — 31,640 31,640 Other — — — — 3,037 3,037 Commercial real estate — Automotive — — — — 3,611 3,611 Total commercial — — — — 38,288 38,288 Total consumer and commercial $ 1,534 $ 324 $ 296 $ 2,154 $ 110,499 $ 112,653 December 31, 2015 Consumer automotive $ 1,618 $ 369 $ 222 $ 2,209 $ 62,083 $ 64,292 Consumer mortgage Mortgage Finance 44 5 10 59 6,354 6,413 Mortgage — Legacy 53 20 73 146 3,214 3,360 Total consumer mortgage 97 25 83 205 9,568 9,773 Total consumer 1,715 394 305 2,414 71,651 74,065 Commercial Commercial and industrial Automotive — — — — 31,469 31,469 Other — — — — 2,640 2,640 Commercial real estate — Automotive — — — — 3,426 3,426 Total commercial — — — — 37,535 37,535 Total consumer and commercial $ 1,715 $ 394 $ 305 $ 2,414 $ 109,186 $ 111,600 The following table presents the gross carrying value of our finance receivables and loans on nonaccrual status. ( $ in millions ) June 30, 2016 December 31, 2015 Consumer automotive $ 505 $ 475 Consumer mortgage Mortgage Finance 12 15 Mortgage — Legacy 95 113 Total consumer mortgage 107 128 Total consumer 612 603 Commercial Commercial and industrial Automotive 51 25 Other 64 44 Commercial real estate — Automotive 7 8 Total commercial 122 77 Total consumer and commercial finance receivables and loans $ 734 $ 680 Management performs a quarterly analysis of the consumer automotive, consumer mortgage, and commercial portfolios using a range of credit quality indicators to assess the adequacy of the allowance for loan losses based on historical and current trends. The following tables present the population of loans by quality indicators for our consumer automotive, consumer mortgage, and commercial portfolios. The following table presents performing and nonperforming credit quality indicators in accordance with our internal accounting policies for our consumer finance receivables and loans recorded at gross carrying value. Nonperforming loans include finance receivables and loans on nonaccrual status when the principal or interest has been delinquent for 90 days or when full collection is not expected. Refer to Note 1 to the Annual Consolidated Financial Statements for additional information. June 30, 2016 December 31, 2015 ( $ in millions ) Performing Nonperforming Total Performing Nonperforming Total Consumer automotive $ 62,776 $ 505 $ 63,281 $ 63,817 $ 475 $ 64,292 Consumer mortgage Mortgage Finance 7,997 12 8,009 6,398 15 6,413 Mortgage — Legacy 2,980 95 3,075 3,247 113 3,360 Total consumer mortgage 10,977 107 11,084 9,645 128 9,773 Total consumer $ 73,753 $ 612 $ 74,365 $ 73,462 $ 603 $ 74,065 The following table presents pass and criticized credit quality indicators based on regulatory definitions for our commercial finance receivables and loans recorded at gross carrying value. June 30, 2016 December 31, 2015 ( $ in millions ) Pass Criticized (a) Total Pass Criticized (a) Total Commercial and industrial Automotive $ 29,638 $ 2,002 $ 31,640 $ 29,613 $ 1,856 $ 31,469 Other 2,354 683 3,037 2,122 518 2,640 Commercial real estate — Automotive 3,445 166 3,611 3,265 161 3,426 Total commercial $ 35,437 $ 2,851 $ 38,288 $ 35,000 $ 2,535 $ 37,535 (a) Includes loans classified as special mention, substandard, or doubtful. These classifications are based on regulatory definitions and generally represent loans within our portfolio that have a higher default risk or have already defaulted. Impaired Loans and Troubled Debt Restructurings Impaired Loans Loans are considered impaired when we determine it is probable that we will be unable to collect all amounts due according to the terms of the loan agreement. For more information on our impaired finance receivables and loans, refer to Note 1 to the Annual Consolidated Financial Statements . The following table presents information about our impaired finance receivables and loans. ( $ in millions ) Unpaid principal balance (a) Gross carrying value Impaired with no allowance Impaired with an allowance Allowance for impaired loans June 30, 2016 Consumer automotive $ 378 $ 348 $ 121 $ 227 $ 26 Consumer mortgage Mortgage Finance 8 8 3 5 — Mortgage — Legacy 250 246 56 190 37 Total consumer mortgage 258 254 59 195 37 Total consumer 636 602 180 422 63 Commercial Commercial and industrial Automotive 51 51 9 42 3 Other 77 64 — 64 17 Commercial real estate — Automotive 7 7 1 6 3 Total commercial 135 122 10 112 23 Total consumer and commercial finance receivables and loans $ 771 $ 724 $ 190 $ 534 $ 86 December 31, 2015 Consumer automotive $ 315 $ 315 $ — $ 315 $ 22 Consumer mortgage Mortgage Finance 9 9 5 4 1 Mortgage — Legacy 260 257 59 198 43 Total consumer mortgage 269 266 64 202 44 Total consumer 584 581 64 517 66 Commercial Commercial and industrial Automotive 25 25 4 21 3 Other 44 44 — 44 15 Commercial real estate — Automotive 8 8 1 7 2 Total commercial 77 77 5 72 20 Total consumer and commercial finance receivables and loans $ 661 $ 658 $ 69 $ 589 $ 86 (a) Adjusted for charge-offs. The following tables present average balance and interest income for our impaired finance receivables and loans. 2016 2015 Three months ended June 30, ( $ in millions ) Average balance Interest income Average balance Interest income Consumer automotive $ 341 $ 4 $ 285 $ 5 Consumer mortgage Mortgage Finance 8 — 7 — Mortgage — Legacy 251 3 252 2 Total consumer mortgage 259 3 259 2 Total consumer 600 7 544 7 Commercial Commercial and industrial Automotive 35 — 41 1 Other 65 — 31 — Commercial real estate — Automotive 6 — 5 — Total commercial 106 — 77 1 Total consumer and commercial finance receivables and loans $ 706 $ 7 $ 621 $ 8 2016 2015 Six months ended June 30, ($ in millions) Average Interest Average Interest Consumer automotive $ 335 $ 8 $ 287 $ 9 Consumer mortgage Mortgage Finance 8 — 7 — Mortgage — Legacy 253 5 282 4 Total consumer mortgage 261 5 289 4 Total consumer 596 13 576 13 Commercial Commercial and industrial Automotive 32 — 38 1 Other 56 1 37 3 Commercial real estate — Automotive 7 — 5 — Total commercial 95 1 80 4 Total consumer and commercial finance receivables and loans $ 691 $ 14 $ 656 $ 17 Troubled Debt Restructurings Troubled Debt Restructurings (TDRs) are loan modifications where concessions were granted to borrowers experiencing financial difficulties. For mortgage loans, as part of our participation in certain governmental programs, we offer mortgage loan modifications to qualified borrowers. Numerous initiatives are in place to provide support to our mortgage customers in financial distress, including principal forgiveness, maturity extensions, delinquent interest capitalization, and changes to contractual interest rates. Additionally, for automotive loans, we may offer several types of assistance to aid our customers, including extension of the loan maturity date and rewriting the loan terms. Total TDRs recorded at gross carrying value were $644 million and $625 million at June 30, 2016 , and December 31, 2015 , respectively. Commercial commitments to lend additional funds to borrowers owing receivables whose terms had been modified in a TDR were $2 million , at both June 30, 2016 , and December 31, 2015 . Refer to Note 1 to the Annual Consolidated Financial Statements for additional information. The following tables present information related to finance receivables and loans recorded at gross carrying value modified in connection with a TDR during the period. 2016 2015 Three months ended June 30, ($ in millions) Number of Pre-modification gross Post-modification Number of Pre-modification gross Post-modification Consumer automotive 4,767 $ 79 $ 68 4,096 $ 64 $ 54 Consumer mortgage Mortgage Finance 2 1 1 — — — Mortgage — Legacy 26 4 4 76 22 21 Total consumer mortgage 28 5 5 76 22 21 Total consumer 4,795 84 73 4,172 86 75 Commercial Commercial and industrial Automotive — — — — — — Other — — — — — — Commercial real estate — Automotive — — — — — — Total commercial — — — — — — Total consumer and commercial finance receivables and loans 4,795 $ 84 $ 73 4,172 $ 86 $ 75 2016 2015 Six months ended June 30, ($ in millions) Number of Pre-modification gross Post-modification Number of Pre-modification gross Post-modification Consumer automotive 10,389 $ 168 $ 144 8,151 $ 127 $ 107 Consumer mortgage Mortgage Finance 3 2 2 2 1 1 Mortgage — Legacy 57 8 8 114 28 26 Total consumer mortgage 60 10 10 116 29 27 Total consumer 10,449 178 154 8,267 156 134 Commercial Commercial and industrial Automotive — — — — — — Other — — — — — — Commercial real estate — Automotive — — — — — — Total commercial — — — — — — Total consumer and commercial finance receivables and loans 10,449 $ 178 $ 154 8,267 $ 156 $ 134 The following tables present information about finance receivables and loans recorded at gross carrying value that have redefaulted during the reporting period and were within 12 months or less of being modified as a TDR. Redefault is when finance receivables and loans meet the requirements for evaluation under our charge-off policy (refer to Note 1 to the Annual Consolidated Financial Statements for additional information) except for commercial finance receivables and loans, where redefault is defined as 90 days past due. 2016 2015 Three months ended June 30, ($ in millions) Number of loans Gross carrying value Charge-off amount Number of loans Gross carrying value Charge-off amount Consumer automotive 1,858 $ 23 $ 13 1,499 $ 18 $ 10 Consumer mortgage Mortgage Finance — — — — — — Mortgage — Legacy 2 — — 3 — — Total consumer finance receivables and loans 1,860 $ 23 $ 13 1,502 $ 18 $ 10 2016 2015 Six months ended June 30, ($ in millions) Number of loans Gross carrying value Charge-off amount Number of loans Gross carrying value Charge-off amount Consumer automotive 3,658 $ 46 $ 25 3,080 $ 37 $ 21 Consumer mortgage Mortgage Finance — — — — — — Mortgage — Legacy 3 — — 7 — — Total consumer finance receivables and loans 3,661 $ 46 $ 25 3,087 $ 37 $ 21

Investment In Operating Leases,

Investment In Operating Leases, Net	6 Months Ended
	Jun. 30, 2016
Leases, Operating [Abstract]
Operating Leases of Lessor Disclosure [Text Block]	Investment in Operating Leases, Net Investments in operating leases were as follows. ($ in millions) June 30, 2016 December 31, 2015 Vehicles $ 17,418 $ 20,211 Accumulated depreciation (3,663 ) (3,940 ) Investment in operating leases, net $ 13,755 $ 16,271 Depreciation expense on operating lease assets includes remarketing gains and losses recognized on the sale of operating lease assets. The following summarizes the components of depreciation expense on operating lease assets. Three months ended June 30, Six months ended June 30, ($ in millions) 2016 2015 2016 2015 Depreciation expense on operating lease assets (excluding remarketing gains) $ 520 $ 671 $ 1,085 $ 1,363 Remarketing gains (86 ) (108 ) (141 ) (178 ) Net depreciation expense on operating lease assets $ 434 $ 563 $ 944 $ 1,185

Securitizations And Variable In

Securitizations And Variable Interest Entities	6 Months Ended
	Jun. 30, 2016
Securitizations And Variable Interest Entities [Abstract]
Securitizations And Variable Interest Entities Disclosure [Text Block]	Securitizations and Variable Interest Entities We are involved in several types of securitization and financing transactions that utilize special-purpose entities (SPEs). A SPE is an entity that is designed to fulfill a specified limited need of the sponsor. Our principal use of SPEs is to obtain liquidity by securitizing certain of our financial assets and operating lease assets. The transaction-specific SPEs involved in our securitization and other financing transactions are often considered VIEs. VIEs are entities that have either a total equity investment at risk that is insufficient to permit the entity to finance its activities without additional subordinated financial support or whose equity investors at risk lack the ability to control the entity's activities. We provide a wide range of consumer and commercial automotive loans, operating leases, and commercial loans to a diverse customer base. We securitize consumer and commercial automotive loans, and operating leases through private-label securitizations. We often securitize these loans and notes secured by operating leases (collectively referred to as financial assets) through the use of securitization entities, which may or may not be consolidated on our Condensed Consolidated Balance Sheet . We provide long-term guarantee contracts to investors in certain nonconsolidated affordable housing entities and have extended a line of credit to provide liquidity and minimize our exposure under these contracts. Since we do not have control over the entities or the power to make decisions, we do not consolidate the entities and our involvement is limited to the guarantee and the line of credit. We have involvement with various other nonconsolidated equity investments, including affordable housing entities and venture capital funds and loan funds. We do not consolidate these entities and our involvement is limited to our outstanding investment, additional capital committed to these funds plus any previously recognized low income housing tax credits that are subject to recapture. Refer to Note 10 to the Annual Consolidated Financial Statements for further description of our securitization activities and our involvement with VIEs. Our involvement with consolidated and nonconsolidated VIEs in which we hold variable interests is presented below. ($ in millions) Involvement Assets of Maximum exposure to June 30, 2016 On-balance sheet variable interest entities Consumer automotive $ 24,557 (b) Commercial automotive 15,791 Off-balance sheet variable interest entities Consumer automotive 24 $ 3,727 (c) $ 3,751 (d) Commercial other 246 (e) — (c) 537 (f) Total $ 40,618 $ 3,727 $ 4,288 December 31, 2015 On-balance sheet variable interest entities Consumer automotive $ 27,967 (b) Commercial automotive 16,763 Off-balance sheet variable interest entities Consumer automotive — $ 3,034 $ 3,034 (d) Commercial other 210 (e) — (c) 493 (f) Total $ 44,940 $ 3,034 $ 3,527 (a) Asset values represent the current unpaid principal balance of outstanding consumer finance receivables and loans within the VIEs. (b) Includes $10.0 billion and $10.6 billion of assets that are not encumbered by VIE beneficial interests held by third parties at June 30, 2016 , and December 31, 2015 , respectively. Ally or consolidated affiliates hold the interests in these assets which eliminate in consolidation. (c) Includes VIEs for which we have no management oversight and therefore we are not able to provide the total assets of the VIEs. (d) Maximum exposure to loss represents the current unpaid principal balance of outstanding loans based on our customary representation and warranty provisions and certain noncertificated interests retained from the sale of automotive finance receivables. This measure is based on the unlikely event that all of the loans have underwriting defects or other defects that trigger a representation and warranty provision and the collateral supporting the loans are worthless. This required disclosure is not an indication of our expected loss. (e) Includes $254 million and $222 million classified as other assets, offset by $8 million and $12 million classified as accrued expenses and other liabilities at June 30, 2016 , and December 31, 2015 , respectively. (f) For certain nonconsolidated affordable housing entities, maximum exposure to loss represents the yield we guaranteed investors through long term guarantee contracts. The amount disclosed is based on the unlikely event that the underlying properties cease generating yield to investors and the yield delivered to investors in the form of low income tax housing credits is recaptured. For nonconsolidated equity investments, maximum exposure to loss represents our outstanding investment, additional committed capital, and low income housing tax credits subject to recapture. The amount disclosed is based on the unlikely event that our committed capital is funded, our investments become worthless, and the tax credits previously delivered to us are recaptured. This required disclosure is not an indication of our expected loss. Cash Flows with Off-balance Sheet Securitization Entities The following table summarizes cash flows received and paid related to securitization entities and asset-backed financings where the transfer is accounted for as a sale and we have a continuing involvement with the transferred assets (e.g., servicing) that were outstanding during the six months ended June 30, 2016 , and 2015 . Additionally, this table contains information regarding cash flows received from and paid to nonconsolidated securitization entities that existed during each period. Six months ended June 30, ( $ in millions ) Consumer automotive 2016 Cash proceeds from transfers completed during the period $ 1,604 Servicing fees 17 Other cash flows 5 2015 Servicing fees $ 13 Delinquencies and Net Credit Losses The following tables represent on-balance sheet loans held-for-sale and finance receivable and loans, off-balance sheet securitizations, and whole-loan sales where we have continuing involvement. The tables present quantitative information about delinquencies and net credit losses. Total Amount Amount 60 days or more ($ in millions) June 30, 2016 December 31, 2015 June 30, 2016 December 31, 2015 On-balance sheet loans Consumer automotive $ 63,281 $ 64,292 $ 533 $ 591 Consumer mortgage 11,084 9,773 87 108 Commercial automotive 35,251 34,895 — — Commercial other 3,052 2,745 — — Total on-balance sheet loans 112,668 111,705 620 699 Off-balance sheet securitization entities Consumer automotive 3,220 2,529 11 9 Total off-balance sheet securitization entities 3,220 2,529 11 9 Whole-loan sales (a) 4,024 2,252 6 13 Total $ 119,912 $ 116,486 $ 637 $ 721 (a) Whole-loan sales are not part of a securitization transaction, but represent consumer automotive pools of loans sold to third-party investors. Net credit losses Three months ended June 30, Six months ended June 30, ($ in millions) 2016 2015 2016 2015 On-balance sheet loans Consumer automotive $ 148 $ 96 $ 321 $ 228 Consumer mortgage 4 4 10 23 Commercial automotive — 1 — — Commercial other — (1 ) — (1 ) Total on-balance sheet loans 152 100 331 250 Off-balance sheet securitization entities Consumer automotive 2 1 4 2 Total off-balance sheet securitization entities 2 1 4 2 Whole-loan sales 1 — 1 — Total $ 155 $ 101 $ 336 $ 252

Servicing Activities

Servicing Activities	6 Months Ended
	Jun. 30, 2016
Servicing Activities [Abstract]
Servicing Activities [Text Block]	Servicing Activities Automotive Finance Servicing Activities We service consumer automotive contracts. Historically, we have sold a portion of our consumer automotive contracts. With respect to contracts we sell, we retain the right to service and earn a servicing fee for our servicing function. We have concluded that the fee we are paid for servicing consumer automotive finance receivables represents adequate compensation, and consequently, we do not recognize a servicing asset or liability. We recognized automotive servicing fee income of $18 million and $31 million during the three months and six months ended June 30, 2016 , respectively, compared to $10 million and $20 million during the three months and six months ended June 30, 2015 . Automotive Finance Serviced Assets The current unpaid principal balance and any related unamortized deferred fees and costs of total serviced automotive finance loans and leases outstanding were as follows. ($ in millions) June 30, 2016 December 31, 2015 On-balance sheet automotive finance loans and leases Consumer automotive $ 63,113 $ 64,067 Commercial automotive 35,251 34,895 Operating leases 13,527 15,965 Other 61 72 Off-balance sheet automotive finance loans Securitizations 3,252 2,550 Whole-loan 4,066 2,259 Total serviced automotive finance loans and leases $ 119,270 $ 119,808

Other Assets

Other Assets	6 Months Ended
	Jun. 30, 2016
Other Assets [Abstract]
Other Assets Disclosure [Text Block]	Other Assets The components of other assets were as follows. ($ in millions) June 30, 2016 December 31, 2015 Property and equipment at cost $ 781 $ 691 Accumulated depreciation (487 ) (456 ) Net property and equipment 294 235 Restricted cash collections for securitization trusts (a) 1,597 2,010 Net deferred tax assets 1,077 1,369 Nonmarketable equity investments (b) 772 418 Accrued interest and rent receivables 404 402 Goodwill (c) 220 27 Fair value of derivative contracts in receivable position (d) 209 233 Cash reserve deposits held-for-securitization trusts (e) 197 252 Other accounts receivable 166 158 Restricted cash and cash equivalents 106 120 Cash collateral placed with counterparties 91 125 Other assets 1,121 972 Total other assets $ 6,254 $ 6,321 (a) Represents cash collections from customer payments on securitized receivables. These funds are distributed to investors as payments on the related secured debt. (b) Includes investments in FHLB stock of $310 million and $391 million and FRB stock of $435 million and $0 million at June 30, 2016 , and December 31, 2015 , respectively. (c) Includes goodwill of $27 million at our Insurance operations at both June 30, 2016 , and December 31, 2015 , and $193 million and $0 million within Corporate and Other at June 30, 2016 , and December 31, 2015 , respectively. As a result of our acquisition of TradeKing, we recognized $193 million of goodwill within Corporate and Other on June 1, 2016 . No other changes in the carrying amount of goodwill were recorded during the six months ended June 30, 2016 . Refer to Note 2 for further discussion. (d) For additional information on derivative instruments and hedging activities, refer to Note 20 . (e) Represents credit enhancement in the form of cash reserves for various securitization transactions.

Deposit Liabilities

Deposit Liabilities	6 Months Ended
	Jun. 30, 2016
Deposits [Abstract]
Deposit Liabilities Disclosures [Text Block]	Deposit Liabilities Deposit liabilities consisted of the following. ( $ in millions ) June 30, 2016 December 31, 2015 Noninterest-bearing deposits $ 94 $ 89 Interest-bearing deposits Savings and money market checking accounts 42,185 36,386 Certificates of deposit 30,323 29,774 Dealer deposits 200 229 Total deposit liabilities $ 72,802 $ 66,478 At June 30, 2016 , and December 31, 2015 , certificates of deposit included $11.5 billion of certificates of deposit in denominations of $100 thousand or more. At June 30, 2016 , and December 31, 2015 , certificates of deposit included $3.1 billion and $3.2 billion , respectively, in denominations in excess of $250 thousand federal insurance limits.

Short-Term Borrowings

Short-Term Borrowings	6 Months Ended
	Jun. 30, 2016
Short-term Debt [Abstract]
Short-term Debt [Text Block]	Short-term Borrowings The following table presents the composition of our short-term borrowings portfolio. June 30, 2016 December 31, 2015 ($ in millions) Unsecured Secured (a) Total Unsecured Secured (a) Total Demand notes $ 3,576 $ — $ 3,576 $ 3,369 $ — $ 3,369 Federal Home Loan Bank — 1,950 1,950 — 4,000 4,000 Securities sold under agreements to repurchase — 468 468 — 648 648 Other — — — 84 — 84 Total short-term borrowings $ 3,576 $ 2,418 $ 5,994 $ 3,453 $ 4,648 $ 8,101 (a) Refer to Note 14 for further details on assets restricted as collateral for payment of the related debt. We periodically enter into term repurchase agreements, short-term borrowing agreements in which we sell financial instruments to one or more investors while simultaneously committing to repurchase them at a specified future date, at the stated price plus accrued interest. As of June 30, 2016 , the financial instruments sold under agreement to repurchase consisted of mortgage-backed residential securities with the following maturities: $369 million within the next 30 days and $99 million within 31 to 60 days. Refer to Note 6 and Note 23 for further details on investment securities sold under agreements to repurchase. The primary risk associated with these repurchase agreements is that the counterparty will be unable to perform under the terms of the contract. As the borrower, we are exposed to the excess market value of the securities pledged over the amount borrowed. Daily mark-to-market collateral management is designed to limit this risk to the initial margin. However, should a counterparty declare bankruptcy or become insolvent, we may incur additional delays and costs. As of June 30, 2016 , we placed cash collateral totaling $7 million with counterparties under these collateral arrangements associated with our repurchase agreements.

Long-Term Debt

Long-Term Debt	6 Months Ended
	Jun. 30, 2016
Long-term Debt, Unclassified [Abstract]
Long-term Debt [Text Block]	Long-term Debt The following table presents the composition of our long-term debt portfolio. June 30, 2016 December 31, 2015 ($ in millions) Unsecured Secured Total Unsecured Secured Total Long-term debt Due within one year $ 4,363 $ 10,496 $ 14,859 $ 1,829 $ 9,427 $ 11,256 Due after one year (a) 16,683 28,961 45,644 18,803 35,844 54,647 Fair value adjustment (b) 520 17 537 334 (3 ) 331 Total long-term debt (c) $ 21,566 $ 39,474 $ 61,040 $ 20,966 $ 45,268 $ 66,234 (a) Includes $2.6 billion of trust preferred securities at both June 30, 2016 , and December 31, 2015 . (b) Represents the fair value adjustment associated with the application of hedge accounting on certain of our long-term debt positions. Refer to Note 20 for additional information. (c) Includes advances from the Federal Home Loan Bank of Pittsburgh of $5.4 billion at both June 30, 2016 , and December 31, 2015 . The following table presents the scheduled remaining maturity of long-term debt at June 30, 2016 , assuming no early redemptions will occur. The actual payment of secured debt may vary based on the payment activity of the related pledged assets. ($ in millions) 2016 2017 2018 2019 2020 2021 and Fair value Total Unsecured Long-term debt $ 1,419 $ 4,365 $ 3,700 $ 1,650 $ 2,212 $ 9,067 $ 520 $ 22,933 Original issue discount (40 ) (88 ) (100 ) (37 ) (37 ) (1,065 ) — (1,367 ) Total unsecured 1,379 4,277 3,600 1,613 2,175 8,002 520 21,566 Secured Long-term debt 3,880 12,140 8,536 7,195 4,087 3,619 17 39,474 Total long-term debt $ 5,259 $ 16,417 $ 12,136 $ 8,808 $ 6,262 $ 11,621 $ 537 $ 61,040 The following summarizes assets restricted as collateral for the payment of the related debt obligation primarily arising from securitization transactions accounted for as secured borrowings and repurchase agreements. June 30, 2016 December 31, 2015 ($ in millions) Total Ally Bank (a) Total Ally Bank (a) Investment securities (b) $ 437 $ — $ 2,420 $ 1,761 Mortgage assets held-for-investment and lending receivables 11,006 11,006 9,743 9,743 Consumer automotive finance receivables 30,911 8,451 34,324 9,167 Commercial automotive finance receivables 19,194 18,878 19,623 19,177 Investment in operating leases, net 3,777 2,059 5,539 3,205 Other assets (b) 46 — — — Total assets restricted as collateral (c) (d) $ 65,371 $ 40,394 $ 71,649 $ 43,053 Secured debt $ 41,892 (e) $ 19,960 $ 49,916 (e) $ 24,787 (a) Ally Bank is a component of the total column. (b) Certain investment securities and other assets are restricted under repurchase agreements. Refer to Note 13 for information on the repurchase agreements. (c) Ally Bank has an advance agreement with the FHLB, and had assets pledged to secure borrowings that were restricted as collateral to the FHLB totaling $14.6 billion and $14.9 billion at June 30, 2016 , and December 31, 2015 , respectively. These assets were composed primarily of consumer mortgage finance receivables and loans, net and investment securities. Ally Bank has access to the Federal Reserve Bank Discount Window. Ally Bank had assets pledged and restricted as collateral to the Federal Reserve Bank totaling $2.6 billion and $2.9 billion at June 30, 2016 , and December 31, 2015 , respectively. These assets were composed of consumer automotive finance receivables and loans, net and investment in operating leases, net. Availability under these programs is only for the operations of Ally Bank and cannot be used to fund the operations or liabilities of Ally or its subsidiaries. (d) Excludes restricted cash and cash reserves for securitization trusts recorded within other assets on the Condensed Consolidated Balance Sheet . Refer to Note 11 for additional information. (e) Includes $2.4 billion and $4.6 billion of short-term borrowings at June 30, 2016 , and December 31, 2015 , respectively. Trust Preferred Securities At June 30, 2016 , we have issued and outstanding approximately $2.6 billion in aggregate liquidation preference of 8.125% Fixed Rate / Floating Rate Trust Preferred Securities, Series 2 (Series 2 TRUPS) net of original issue discount and debt issuance costs. Each Series 2 TRUPS security has a liquidation amount of $25. Distributions are cumulative and are payable until redemption at the applicable coupon rate. Distributions were payable at an annual rate of 8.125% payable quarterly in arrears, through but excluding February 15, 2016. From and including February 15, 2016, to but excluding February 15, 2040, distributions will be payable at an annual rate equal to three-month London interbank offer rate plus 5.785% payable quarterly in arrears, beginning May 15, 2016. Ally has the right to defer payments of interest for a period not exceeding 20 consecutive quarters. The Series 2 TRUPS have no stated maturity date, but must be redeemed upon the redemption or maturity of the related debentures (Debentures), which mature on February 15, 2040. Ally at any time on or after February 15, 2016 may redeem the Series 2 TRUPS at a redemption price equal to 100% of the principal amount being redeemed, plus accrued and unpaid interest through the date of redemption. The Series 2 TRUPS are generally nonvoting, other than with respect to certain limited matters. During any period in which any Series 2 TRUPS remain outstanding but in which distributions on the Series 2 TRUPS have not been fully paid, none of Ally or its subsidiaries will be permitted to (i) declare or pay dividends on, make any distributions with respect to, or redeem, purchase, acquire or otherwise make a liquidation payment with respect to, any of Ally’s capital stock or make any guarantee payment with respect thereto; or (ii) make any payments of principal, interest, or premium on, or repay, repurchase or redeem, any debt securities or guarantees that rank on a parity with or junior in interest to the Debentures with certain specified exceptions in each case. Funding Facilities We utilize both committed credit facilities and other collateralized funding vehicles. The debt outstanding under our various funding facilities is included on our Condensed Consolidated Balance Sheet . As of June 30, 2016 , Ally Bank had exclusive access to $4.0 billion of funding capacity from committed credit facilities. Funding programs supported by the Federal Reserve and the FHLB, together with repurchase agreements, complement Ally Bank’s private collateralized funding vehicles. The total capacity in our committed funding facilities is provided by banks and other financial institutions through private transactions. The committed secured funding facilities can be revolving in nature and allow for additional funding during the commitment period, or they can be amortizing and not allow for any further funding after the closing date. At June 30, 2016 , all of our $19.6 billion of committed capacity was revolving. Our revolving facilities generally have an original tenor ranging from 364 days to two years. As of June 30, 2016 , we had $15.2 billion of committed funding capacity from revolving facilities with a remaining tenor greater than 364 days. Committed Funding Facilities Outstanding Unused capacity (a) Total capacity ($ in millions) June 30, 2016 December 31, 2015 June 30, 2016 December 31, 2015 June 30, 2016 December 31, 2015 Bank funding Secured (b) $ 2,950 $ 3,250 $ 1,050 $ — $ 4,000 $ 3,250 Parent funding Secured 14,540 16,914 1,085 251 15,625 17,165 Total committed facilities $ 17,490 $ 20,164 $ 2,135 $ 251 $ 19,625 $ 20,415 (a) Funding from committed secured facilities is available on request in the event excess collateral resides in certain facilities or is available to the extent incremental collateral is available and contributed to the facilities. (b) Excludes off-balance sheet credit facility amounts.

Accrued Expenses and Other Liab

Accrued Expenses and Other Liabilities	6 Months Ended
	Jun. 30, 2016
Accounts Payable and Accrued Liabilities [Abstract]
Accounts Payable and Accrued Liabilities Disclosure [Text Block]	Accrued Expenses and Other Liabilities The components of accrued expenses and other liabilities were as follows. ($ in millions) June 30, 2016 December 31, 2015 Accounts payable $ 497 $ 391 Employee compensation and benefits 196 242 Reserves for insurance losses and loss adjustment expenses 164 169 Cash collateral received from counterparties 146 82 Fair value of derivative contracts in payable position (a) 87 145 Deferred revenue 78 108 Other liabilities 424 408 Total accrued expenses and other liabilities $ 1,592 $ 1,545 (a) For additional information on derivative instruments and hedging activities, refer to Note 20 .

Preferred Stock

Preferred Stock	6 Months Ended
	Jun. 30, 2016
Preferred Stock, Including Additional Paid in Capital [Abstract]
Preferred Stock [Text Block]	Preferred Stock The following table summarizes information about our Series A Preferred Stock. June 30, 2016 December 31, 2015 Series A preferred stock Carrying value ($ in millions) $ — $ 696 Par value (per share) — 0.01 Liquidation preference (per share) — 25 Number of shares authorized — 40,870,560 Number of shares issued and outstanding — 27,870,560 Dividend/coupon Prior to May 15, 2016 — % 8.5 % On and after May 15, 2016 — % Three month Series A Preferred Stock On April 14, 2016, we issued a Notice of Redemption to the holders of the outstanding Series A Preferred Stock to redeem the remaining 27,870,560 shares at a redemption price of $25 per share, plus approximately $0.53 per share of accrued and unpaid dividends through the redemption date. On May 16, 2016 , we redeemed the 27,870,560 outstanding shares of Series A Preferred Stock, with an aggregate liquidation preference of $697 million for $712 million in cash, which included $15 million in accrued and unpaid dividends through the redemption date. Upon redemption of the shares of Series A Preferred Stock, we derecognized the carrying value of $696 million . Effective May 16, 2016, the Series A Preferred Stock was retired.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss)	6 Months Ended
	Jun. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Abstract]
Comprehensive Income (Loss) Note [Text Block]	Accumulated Other Comprehensive (Loss) Income The following table presents changes, net of tax, in each component of accumulated other comprehensive (loss) income. ($ in millions) Unrealized (losses) gains on investment securities (a) Translation adjustments and net investment hedges (b) Cash flow hedges Defined benefit pension plans Accumulated other comprehensive (loss) income Balance at December 31, 2014 $ (21 ) $ 36 $ 7 $ (88 ) $ (66 ) 2015 net change (97 ) (20 ) — — (117 ) Balance at June 30, 2015 $ (118 ) $ 16 $ 7 $ (88 ) $ (183 ) Balance at December 31, 2015 $ (159 ) $ 9 $ 8 $ (89 ) $ (231 ) 2016 net change 262 5 — (1 ) 266 Balance at June 30, 2016 $ 103 $ 14 $ 8 $ (90 ) $ 35 (a) Represents the after-tax difference between the fair value and amortized cost of our available-for-sale securities portfolio. (b) For additional information on derivative instruments and hedging activities, refer to Note 20 . The following tables present the before- and after-tax changes in each component of accumulated other comprehensive (loss) income. Three months ended June 30, 2016 ($ in millions) Before Tax Tax Effect After Tax Investment securities Net unrealized gains arising during the period $ 185 $ (25 ) $ 160 Less: Net realized gains reclassified to income from continuing operations 39 (a) 1 (b) 40 Net change 146 (26 ) 120 Translation adjustments Net unrealized losses arising during the period (1 ) — (1 ) Less: Net realized losses reclassified to income from discontinued operations, net of tax (1 ) — (1 ) Net change — — — Other comprehensive income $ 146 $ (26 ) $ 120 (a) Includes gains reclassified to other gain on investments, net in our Condensed Consolidated Statement of Comprehensive Income . (b) Includes amounts reclassified to income tax expense from continuing operations in our Condensed Consolidated Statement of Comprehensive Income . Three months ended June 30, 2015 ($ in millions) Before Tax Tax Effect After Tax Investment securities Net unrealized losses arising during the period $ (191 ) $ 71 $ (120 ) Less: Net realized gains reclassified to income from continuing operations 45 (a) (16 ) (b) 29 Net change (236 ) 87 (149 ) Translation adjustments Net unrealized gains arising during the period 4 (1 ) 3 Less: Net realized gains reclassified to income from discontinued operations, net of tax 1 — 1 Net change 3 (1 ) 2 Net investment hedges Net unrealized losses arising during the period (2 ) 1 (1 ) Other comprehensive loss $ (235 ) $ 87 $ (148 ) (a) Includes gains reclassified to other gain on investments, net in our Condensed Consolidated Statement of Comprehensive Income . (b) Includes amounts reclassified to income tax expense from continuing operations in our Condensed Consolidated Statement of Comprehensive Income . Six months ended June 30, 2016 ($ in millions) Before Tax Tax Effect After Tax Investment securities Net unrealized gains arising during the period $ 465 $ (129 ) $ 336 Less: Net realized gains reclassified to income from continuing operations 93 (a) (19 ) (b) 74 Net change 372 (110 ) 262 Translation adjustments Net unrealized gains arising during the period 12 (5 ) 7 Less: Net realized losses reclassified to income from discontinued operations, net of tax (1 ) — (1 ) Net change 13 (5 ) 8 Net investment hedges Net unrealized losses arising during the period (6 ) 3 (3 ) Defined benefit pension plans Net unrealized losses arising during the period (1 ) — (1 ) Other comprehensive income $ 378 $ (112 ) $ 266 (a) Includes gains reclassified to other gain on investments, net in our Condensed Consolidated Statement of Comprehensive Income. (b) Includes amounts reclassified to income tax expense (benefit) from continuing operations in our Condensed Consolidated Statement of Comprehensive Income. Six months ended June 30, 2015 ($ in millions) Before Tax Tax Effect After Tax Investment securities Net unrealized losses arising during the period $ (53 ) $ 20 $ (33 ) Less: Net realized gains reclassified to income from continuing operations 100 (a) (36 ) (b) 64 Net change (153 ) 56 (97 ) Translation adjustments Net unrealized losses arising during the period (16 ) 6 (10 ) Less: Net realized gains reclassified to income from discontinued operations, net of tax 43 (20 ) 23 Net change (59 ) 26 (33 ) Net investment hedges Net unrealized gains arising during the period 16 (6 ) 10 Less: Net realized losses reclassified to income from discontinued operations, net of tax (4 ) 1 (3 ) Net change 20 (7 ) 13 Other comprehensive loss $ (192 ) $ 75 $ (117 ) (a) Includes gains reclassified to other gain on investments, net in our Condensed Consolidated Statement of Comprehensive Income. (b) Includes amounts reclassified to income tax expense (benefit) from continuing operations in our Condensed Consolidated Statement of Comprehensive Income.

Earnings Per Common Share

Earnings Per Common Share	6 Months Ended
	Jun. 30, 2016
Earnings Per Share [Abstract]
Earnings Per Share [Text Block]	Earnings per Common Share The following table presents the calculation of basic and diluted earnings per common share. Three months ended June 30, Six months ended June 30, ( $ in millions, except share data ) (a) 2016 2015 2016 2015 Net income from continuing operations $ 357 $ 169 $ 604 $ 348 Preferred stock dividends (b) (15 ) (1,251 ) (30 ) (1,318 ) Net income (loss) from continuing operations attributable to common shareholders 342 (1,082 ) 574 (970 ) Income from discontinued operations, net of tax 3 13 6 410 Net income (loss) attributable to common shareholders $ 345 $ (1,069 ) $ 580 $ (560 ) Basic weighted-average common shares outstanding (c) 485,370,318 482,847,164 484,801,782 482,550,842 Diluted weighted-average common shares outstanding (c) (d) 486,074,474 482,847,164 485,364,351 482,550,842 Basic earnings per common share Net income (loss) from continuing operations $ 0.70 $ (2.24 ) $ 1.18 $ (2.01 ) Income from discontinued operations, net of tax 0.01 0.03 0.01 0.85 Net income (loss) $ 0.71 $ (2.22 ) $ 1.20 $ (1.16 ) Diluted earnings per common share Net income (loss) from continuing operations $ 0.70 $ (2.24 ) $ 1.18 $ (2.01 ) Income from discontinued operations, net of tax 0.01 0.03 0.01 0.85 Net income (loss) $ 0.71 $ (2.22 ) $ 1.19 $ (1.16 ) (a) Figures in the table may not recalculate exactly due to rounding. Earnings per share is calculated based on unrounded numbers. (b) Preferred stock dividends for the three months and six months ended June 30, 2015 , include $1,193 million recognized in connection with the partial redemption of the Series G Preferred Stock and the repurchase of the Series A Preferred Stock. These dividends represent an additional return to preferred shareholders calculated as the excess consideration paid over the carrying amount derecognized. (c) Includes shares related to share-based compensation that vested but were not yet issued for the three months and six months ended June 30, 2016 , and 2015 , respectively. (d) Due to antidilutive effect of the net loss from continuing operations attributable to common shareholders for the three months and six months ended June 30, 2015 , basic weighted-average common shares outstanding were used to calculate basic and diluted earnings per share.

Regulatory Capital

Regulatory Capital	6 Months Ended
	Jun. 30, 2016
Regulatory Capital Requirements [Abstract]
Regulatory Capital Requirements under Banking Regulations [Text Block]	Regulatory Capital and Other Regulatory Matters As a BHC, we and our wholly-owned state-chartered banking subsidiary, Ally Bank, are subject to capital requirements issued by U.S. banking regulators that require us to maintain risk-based and leverage capital ratios above minimum levels. A risk-based capital ratio is a ratio of a banking organization’s regulatory capital to its risk-weighted assets. A leverage capital ratio is a ratio of a banking organization’s regulatory capital to a measure of assets or exposures that is not risk-weighted. As of January 1, 2015, Ally and Ally Bank became subject to the rules implementing the 2010 Basel III capital framework in the United States (U.S. Basel III), which reflect new and higher capital requirements, capital buffers, and new regulatory capital definitions, deductions and adjustments. Certain aspects of U.S. Basel III, including the new capital buffers and regulatory capital deductions, will be phased in over several years. Failure to meet minimum capital requirements can initiate certain mandatory and possibly additional discretionary action by regulators that, if undertaken, could have a direct material effect on the Condensed Consolidated Financial Statements or the results of operations and financial condition of Ally and Ally Bank. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, we and Ally Bank must meet specific capital guidelines that involve quantitative measures of capital, assets and certain off-balance sheet items. These measures and related classifications, which are used in the calculation of our risk-based and leverage capital ratios and those of Ally Bank, are also subject to qualitative judgments by the regulators about the components of capital, the risk-weightings of assets and other exposures, and other factors. The U.S. banking regulators also use these ratios and guidelines as part of the capital planning and stress testing processes. In addition, in order for Ally to maintain its status as a FHC, Ally and its bank subsidiary, Ally Bank, must remain “well-capitalized” and “well-managed,” as defined under applicable law. Effective January 1, 2015, the “well-capitalized” standard for insured depository institutions, such as Ally Bank, was revised to reflect the new and higher capital requirements under U.S. Basel III. Under U.S. Basel III, Ally must maintain a minimum Common Equity Tier 1 risk-based capital ratio of 4.5% , a minimum Tier 1 risk-based capital ratio of 6% , and a minimum Total risk-based capital ratio of 8% . In addition to these minimum requirements, Ally is also subject to a Common Equity Tier 1 capital conservation buffer of more than 2.5% , subject to a phase-in from January 1, 2016 through December 31, 2018. Failure to maintain the full amount of the buffer will result in restrictions on Ally’s ability to make capital distributions, including dividend payment and stock repurchases and redemptions, and to pay discretionary bonuses to executive officers. In addition to these new risk-based capital standards, U.S. Basel III subjects all U.S. banking organizations, including Ally, to a minimum Tier 1 leverage ratio of 4% , the denominator of which takes into account only on-balance sheet assets. In addition to introducing new capital ratios, U.S. Basel III revises the eligibility criteria for regulatory capital instruments and provides for the phase-out of instruments that had previously been recognized as capital but that do not satisfy the new criteria. Subject to certain exceptions (e.g., for certain debt or equity issued to the U.S. government under the Emergency Economic Stabilization Act), trust preferred and other “hybrid” securities are no longer included in a BHC's Tier 1 capital as of January 1, 2016. Also, subject to a phase-in schedule, certain new items are deducted from Common Equity Tier 1 capital, and certain other deductions from regulatory capital have been modified. Among other things, U.S. Basel III requires significant investments in the common shares of unconsolidated financial institutions, mortgage servicing rights, and certain deferred tax assets that exceed specified individual and aggregate thresholds to be deducted from Common Equity Tier 1 capital. U.S. Basel III also revises the standardized approach for calculating risk-weighted assets by, among other things, modifying certain risk weights and introducing new methods for calculating risk-weighted assets for certain types of assets and exposures. Ally is subject to the U.S. Basel III standardized approach for credit risk. It is not subject to the U.S. Basel III advanced approaches for credit risk. Ally is currently not subject to the U.S. market risk capital rule, which applies only to banking organizations with significant trading assets and liabilities. On March 7, 2016, Ally Bank received approval from the Federal Reserve to become a state member bank. Ally Bank is now regulated by the FRB through the Federal Reserve Bank of Chicago, as well as the Utah Department of Financial Institutions. In addition, in connection with the application for membership in the Federal Reserve System, Ally Bank made commitments to the FRB relating to capital, liquidity, and business plan requirements that are consistent with existing requirements pursuant to the Capital and Liquidity Maintenance Agreement (CLMA) that was entered into with the Federal Deposit Insurance Corporation including the requirement to maintain capital at a level such that its Tier 1 leverage ratio is at least 15%. For this purpose, the leverage ratio is determined in accordance with the FRB's regulations related to capital maintenance. As a requirement of Federal Reserve membership, on March 21, 2016, Ally Bank purchased $435 million of FRB stock. Compliance with capital requirements is a strategic priority for Ally. We expect to be in compliance with all applicable requirements within the established timeframes. The following table summarizes our capital ratios under the U.S. Basel III capital framework. June 30, 2016 December 31, 2015 Required Well-capitalized ( $ in millions ) Amount Ratio Amount Ratio Capital ratios Common Equity Tier 1 (to risk-weighted assets) Ally Financial Inc. $ 12,829 9.59 % $ 12,507 9.21 % 4.50 % (a) Ally Bank 17,209 17.64 16,594 17.05 4.50 6.50 % Tier 1 (to risk-weighted assets) Ally Financial Inc. $ 14,959 11.18 % $ 15,077 11.10 % 6.00 % 6.00 % Ally Bank 17,209 17.64 16,594 17.05 6.00 8.00 Total (to risk-weighted assets) Ally Financial Inc. $ 17,166 12.83 % $ 17,005 12.52 % 8.00 % 10.00 % Ally Bank 17,712 18.15 17,043 17.51 8.00 10.00 Tier 1 leverage (to adjusted quarterly average assets) (b) Ally Financial Inc. $ 14,959 9.63 % $ 15,077 9.73 % 4.00 % (a) Ally Bank 17,209 15.31 16,594 15.38 15.00 (c) 5.00 % (a) Currently, there is no ratio component for determining whether a BHC is "well-capitalized." (b) Federal regulatory reporting guidelines require the calculation of adjusted quarterly average assets using a daily average methodology. (c) Ally Bank has committed to the FRB to maintain a Tier 1 leverage ratio of at least 15% . At June 30, 2016 , Ally and Ally Bank were “well-capitalized” and met all capital requirements to which each was subject. Capital Planning and Stress Tests As a BHC with $50 billion or more of consolidated assets, Ally is required to conduct periodic company-run stress tests, is subject to an annual supervisory stress test conducted by the FRB, and must submit an annual capital plan to the FRB. Ally’s capital plan must include a description of all planned capital actions over a nine-quarter planning horizon. The capital plan must also include a discussion of how Ally will maintain capital above the minimum regulatory capital ratios under baseline, adverse, and severely adverse economic scenarios, and serve as a source of strength to Ally Bank. The FRB must approve Ally's capital plan before Ally may take any capital action. Even with an approved capital plan, Ally must seek the approval of the FRB before making a capital distribution if, among other factors, Ally would not meet its regulatory capital requirements after making the proposed capital distribution. In addition to the Series G preferred stock redemptions and Series A preferred stock repurchase that occurred during 2015, as part of the 2015 CCAR process, Ally also received approval to repurchase or redeem the remaining approximately $700 million of Series A preferred stock as well as $500 million of our Trust Preferred Securities. The remaining shares of Series A preferred stock were redeemed on May 16, 2016 , but we have indefinitely deferred redemption of the Trust Preferred Securities in support of our acquisition of TradeKing, which closed on June 1, 2016. On April 5, 2016, we submitted the results of our semi-annual stress test and our annual capital plan to the FRB. On June 23, 2016, we publicly disclosed summary results of the stress test under the most severe scenario in accordance with regulatory requirements. On June 29, 2016, we received a non-objection to our capital plan from the FRB, including the proposed capital actions contained in our submission. The planned capital actions include a quarterly cash dividend of $0.08 per share of our common stock and the ability to repurchase up to $700 million of our common stock from time to time through the second quarter of 2017. On July 18, 2016 , the Ally Board of Directors declared a quarterly cash dividend payment of $0.08 per share on all common stock. The dividend is payable on August 15, 2016 , to shareholders of record at the close of business on August 1, 2016. Additionally, the Ally Board of Directors authorized a common stock repurchase program of up to $700 million beginning in the third quarter of 2016 and continuing through the second quarter of 2017. We had 483,753,360 shares of common stock outstanding at June 30, 2016.

Derivative Instruments And Hedg

Derivative Instruments And Hedging Activities	6 Months Ended
	Jun. 30, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments and Hedging Activities Disclosure [Text Block]	Derivative Instruments and Hedging Activities We enter into interest rate, foreign-currency, and equity swaps, futures, forwards, options, and swaptions in connection with our market risk management activities. Derivative instruments are used to manage interest rate risk relating to specific groups of assets and liabilities, including automotive loan assets and debt. We use foreign exchange contracts to mitigate foreign-currency risk associated with foreign-currency-denominated debt, foreign exchange transactions, and our net investment in foreign subsidiaries. In addition, we also enter into equity option contracts to manage our exposure to the equity markets. Our primary objective for utilizing derivative financial instruments is to manage interest rate risk associated with our fixed- and variable-rate assets and liabilities, foreign exchange risks related to our foreign-currency denominated assets and liabilities, and market risks related to our investment portfolio and certain of our executive share-based compensation plans. Interest Rate Risk We monitor our mix of fixed- and variable-rate assets and liabilities. When it is cost-effective to do so, we may enter into interest rate swaps, forwards, futures, options, and swaptions to achieve our desired mix of fixed- and variable-rate assets and liabilities. We execute interest rate swaps, forwards, futures, options, and swaptions to modify our exposure to interest rate risk by converting certain fixed-rate instruments to a variable-rate and certain variable-rate instruments to a fixed-rate. We use a mix of both derivatives that qualify for hedge accounting treatment and economic hedges. Derivatives qualifying for hedge accounting consist of receive-fixed swaps designated as fair value hedges of specific fixed-rate unsecured debt obligations, receive-fixed swaps designated as fair value hedges of specific fixed-rate FHLB advances and pay-fixed swaps designated as fair value hedges of specific portfolios of fixed-rate held-for-investment retail automotive loan assets. In 2015, we also had pay-fixed swaps designated as cash flow hedges of the expected future cash flows in the form of interest payments on certain outstanding variable-rate borrowings associated with our secured debt. We also execute economic hedges, which consist of interest rate swaps and interest rate caps held to mitigate interest rate risk associated with our debt portfolio. We also use interest rate swaps to economically hedge our net fixed-versus-variable interest rate exposure. We enter into economic hedges in the form of short-dated, exchange-traded Eurodollar futures to hedge the interest rate exposure of our fixed-rate automotive loans, as well as forwards, options, and swaptions to economically hedge our net fixed-versus-variable interest rate exposure. Foreign Exchange Risk We enter into derivative financial instrument contracts to mitigate the risk associated with variability in cash flows related to our various foreign-currency exposures. We enter into foreign-currency forwards with external counterparties as net investment hedges of foreign exchange exposure on our investments in foreign subsidiaries. Our equity is impacted by the cumulative translation adjustments resulting from the translation of foreign subsidiary results; this impact is reflected in our accumulated other comprehensive (loss) income. We also enter into foreign-currency forwards to economically hedge our foreign-denominated debt, our centralized lending program, and foreign-denominated third party loans. These forward currency forwards that are used as economic hedges are recorded at fair value with changes recorded as income offsetting the gains and losses on the associated foreign-currency transactions. We utilized a cross-currency swap to economically hedge foreign exchange exposure on foreign-currency-denominated debt by converting the funding currency to our functional currency. This swap matured during the second quarter of 2015. Market Risk We enter into equity options to economically hedge our exposure to the equity markets. We purchase options to assume a long position on certain equities and write options to assume a short position. We also enter into prepaid equity forward contracts to economically hedge the price risk associated with certain of our executive share-based compensation plans. The prepaid equity forward contracts are hybrid instruments containing an embedded forward contract, which is considered a derivative instrument. The embedded derivative instrument is bifurcated from the host contract and is recorded at fair value with changes in fair value recorded in compensation and benefits expense. The balance of the prepaid component of these equity forward contracts was $17 million as of June 30, 2016 , and was recorded within other assets on the Condensed Consolidated Balance Sheet . Counterparty Credit Risk Derivative financial instruments contain an element of credit risk if counterparties are unable to meet the terms of the agreements. Credit risk associated with derivative financial instruments is measured as the net replacement cost should the counterparties that owe us under the contract completely fail to perform under the terms of those contracts, assuming no recoveries of underlying collateral as measured by the market value of the derivative financial instrument. To mitigate the risk of counterparty default, we maintain collateral agreements with certain counterparties. The agreements require both parties to post collateral in the event the fair values of the derivative financial instruments meet posting thresholds established under the agreements. In the event that either party defaults on the obligation, the secured party may seize the collateral. Generally, our collateral arrangements are bilateral such that we and the counterparty post collateral for the value of our total obligation to each other. Contractual terms provide for standard and customary exchange of collateral based on changes in the market value of the outstanding derivatives. The securing party posts additional collateral when their obligation rises or removes collateral when it falls. Certain derivative instruments contain provisions that require us to either post additional collateral or immediately settle any outstanding liability balances upon the occurrence of a specified credit risk-related event. No such specified credit risk related events occurred during the second quarter of 2016. We placed cash collateral totaling $84 million and securities collateral totaling $55 million at June 30, 2016 , and $103 million and $86 million at December 31, 2015 , respectively, in accounts maintained by counterparties. This amount primarily relates to collateral posted to support our derivative positions. This amount also excludes cash and securities pledged as collateral under repurchase agreements. At June 30, 2016 , and December 31, 2015 , we placed cash collateral totaling $7 million and $21 million , respectively, with counterparties under collateral arrangements associated with repurchase agreements. Refer to Note 13 for details on the repurchase agreements. The receivables for cash collateral placed are included in our Condensed Consolidated Balance Sheet in other assets. We received cash collateral from counterparties totaling $146 million at June 30, 2016 , primarily to support these derivative positions. We received cash collateral from counterparties totaling $82 million at December 31, 2015 . This amount also excludes cash and securities pledged as collateral under repurchase agreements. Refer to Note 13 for details on the repurchase agreements. The payables for cash collateral received are included on our Condensed Consolidated Balance Sheet in accrued expenses and other liabilities. In certain circumstances, we receive or post securities as collateral with counterparties. We do not record collateral received on our Condensed Consolidated Balance Sheet unless certain conditions are met. At June 30, 2016 , and December 31, 2015 , we received noncash collateral of $2 million and $7 million , respectively. Included in these amounts is noncash collateral where we have been granted the right to sell or pledge the underlying assets. We have not sold or pledged any of the noncash collateral received under these agreements. Balance Sheet Presentation The following table summarizes the fair value amounts of derivative instruments reported on our Condensed Consolidated Balance Sheet . The fair value amounts are presented on a gross basis, are segregated by derivatives that are designated and qualifying as hedging instruments or those that are not, and are further segregated by type of contract within those two categories. Notional amounts are reference amounts from which contractual obligations are derived and are not recorded on the balance sheet. In our view, derivative notional is not an accurate measure of our derivative exposure when viewed in isolation from other factors, such as market rate fluctuations and counterparty credit risk. June 30, 2016 December 31, 2015 Derivative contracts in a Notional Derivative contracts in a Notional ( $ in millions ) receivable payable receivable payable Derivatives designated as accounting hedges Interest rate contracts Swaps (c) (d) (e) $ 164 $ 22 $ 8,101 $ 126 $ 9 $ 14,151 Foreign exchange contracts Forwards 4 — 212 — 1 189 Total derivatives designated as accounting hedges 168 22 8,313 126 10 14,340 Derivatives not designated as accounting hedges Interest rate contracts Swaps 17 39 1,461 30 51 6,101 Futures and forwards 1 — 501 2 2 1,905 Written options — 18 16,920 — 72 18,220 Purchased options 18 — 16,920 73 — 18,240 Total interest rate risk 36 57 35,802 105 125 44,466 Foreign exchange contracts Futures and forwards 3 2 127 — — 278 Total foreign exchange risk 3 2 127 — — 278 Equity contracts Forwards — 5 17 — 9 32 Written options — 1 1 — 1 — Purchased options 2 — — 2 — — Total equity risk 2 6 18 2 10 32 Total derivatives not designated as accounting hedges 41 65 35,947 107 135 44,776 Total derivatives $ 209 $ 87 $ 44,260 $ 233 $ 145 $ 59,116 (a) Derivative contracts in a receivable position are classified as other assets on the Condensed Consolidated Balance Sheet , and includes accrued interest of $15 million and $46 million at June 30, 2016 , and December 31, 2015 , respectively. (b) Derivative contracts in a liability position are classified as accrued expenses and other liabilities on the Condensed Consolidated Balance Sheet , and includes accrued interest of $4 million and $12 million at June 30, 2016 , and December 31, 2015 , respectively. (c) Includes fair value hedges consisting of receive-fixed swaps on fixed-rate unsecured debt obligations with $146 million and $112 million in a receivable position, $0 million and $3 million in a payable position, and a $2.6 billion and $6.8 billion notional amount at June 30, 2016 , and December 31, 2015 , respectively. The hedge notional amount of $2.6 billion at June 30, 2016 , is associated with debt maturing in five or more years. (d) Includes fair value hedges consisting of receive-fixed swaps on fixed-rate secured debt obligations (FHLB Advances) with $18 million and $1 million in a receivable position, $0 million and $2 million in a payable position, and a $698 million and $500 million notional amount at June 30, 2016 , and December 31, 2015 , respectively. (e) Other fair value hedges include pay-fixed swaps on portfolios of held-for-investment automotive loan assets with $0 million and $13 million in a receivable position, $22 million and $3 million in a payable position, and a $4.8 billion and $6.8 billion notional amount at June 30, 2016 , and December 31, 2015 , respectively. Statement of Comprehensive Income Presentation The following table summarizes the location and amounts of gains and losses on derivative instruments reported in our Condensed Consolidated Statement of Comprehensive Income . Three months ended June 30, Six months ended June 30, ( $ in millions ) 2016 2015 2016 2015 Derivatives qualifying for hedge accounting (Loss) gain recognized in earnings on derivatives Interest rate contracts Interest and fees on finance receivables and loans (a) $ (6 ) $ 7 $ (34 ) $ (16 ) Interest on long-term debt (b) (c) 51 (97 ) 242 (11 ) Gain (loss) recognized in earnings on hedged items Interest rate contracts Interest and fees on finance receivables and loans (d) 5 2 33 35 Interest on long-term debt (e) (50 ) 94 (246 ) 7 Total derivatives qualifying for hedge accounting — 6 (5 ) 15 Derivatives not designated as accounting hedges Gain (loss) recognized in earnings on derivatives Interest rate contracts Gain on mortgage and automotive loans, net — 2 — — Other income, net of losses 1 3 3 (9 ) Total interest rate contracts 1 5 3 (9 ) Foreign exchange contracts (f) Interest on long-term debt (1 ) 5 (2 ) (138 ) Other income, net of losses 1 (3 ) (3 ) 8 Total foreign exchange contracts — 2 (5 ) (130 ) Equity contracts Compensation and benefits expense (1 ) 3 (2 ) (3 ) Total equity contracts (1 ) 3 (2 ) (3 ) Gain (loss) recognized in earnings on derivatives $ — $ 16 $ (9 ) $ (127 ) (a) Amounts exclude losses related to interest for qualifying accounting hedges of retail automotive loans held-for-investment, which are primarily offset by the fixed coupon payments of the loans. The losses were $5 million and $15 million for the three months ended June 30, 2016 , and 2015 , respectively, and $12 million and $32 million for the six months ended June 30, 2016 , and 2015 , respectively. (b) Amounts exclude gains related to interest for qualifying accounting hedges of unsecured debt, which are primarily offset by the fixed coupon payment on the long-term debt. The gains were $11 million and $24 million for the three months ended June 30, 2016 , and 2015 , respectively, and $27 million and $47 million for the six months ended June 30, 2016 , and 2015 , respectively. (c) Amounts exclude gains related to interest for qualifying accounting hedges of secured debt (FHLB Advances), which are primarily offset by the fixed coupon payment on the long-term debt. The gains were $2 million and $3 million for the three months and six months ended June 30, 2016 . (d) Amounts exclude losses related to amortization of deferred loan basis adjustments on the de-designated hedged item of $4 million and $1 million for the three months ended June 30, 2016 , and 2015 , respectively, and $9 million and $1 million for the six months ended June 30, 2016 , and 2015 , respectively. (e) Amounts exclude gains related to amortization of deferred debt basis adjustments on the de-designated hedged item of $21 million and $16 million for the three months ended June 30, 2016 , and 2015 , respectively, and $39 million and $44 million for the six months ended June 30, 2016 , and 2015 , respectively. (f) Amounts exclude gains and losses related to the revaluation of the related foreign-denominated debt or receivable. The losses were $1 million for the three months ended June 30, 2016 , and three months ended 2015 , and the gains were $3 million and $133 million for the six months ended June 30, 2016 , and 2015 , respectively. The following table summarizes derivative instruments used in cash flow and net investment hedge accounting relationships. Three months ended June 30, Six months ended June 30, ( $ in millions ) 2016 2015 2016 2015 Foreign exchange contracts Loss reclassified from accumulated other comprehensive loss to income from discontinued operations, net $ — $ — $ — $ (4 ) Total loss from discontinued operations, net $ — $ — $ — $ (4 ) (Loss) gain recognized in other comprehensive income (a) $ — $ (2 ) $ (6 ) $ 20 (a) The amounts represent the effective portion of net investment hedges. There are offsetting amounts recognized in accumulated other comprehensive income (loss) related to the revaluation of the related net investment in foreign operations, including the tax impacts of the hedge and related net investment, as disclosed separately in Note 17 . There were gains of $0 million and losses of $3 million for the three months ended June 30, 2016 , and 2015 , respectively.

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2016
Income Tax Disclosure [Abstract]
Income Tax Disclosure [Text Block]	Income Taxes We recognized total income tax expense from continuing operations of $56 million and $206 million for the three months and six months ended June 30, 2016 , compared to income tax expense of $94 million and $197 million for the same periods in 2015 . The changes in income tax expense for the three months and six months ended June 30, 2016 , compared to the same periods in 2015 , were primarily driven by a tax benefit that resulted from a U.S. tax reserve release related to a prior year federal return that reduced our liability for unrecognized tax benefits during the three months ended June 30, 2016, by $175 million . This tax benefit was offset by increases in tax expense attributable to higher pretax earnings and the establishment of a valuation allowance on capital loss carryforwards. As of each reporting date, we consider existing evidence, both positive and negative, that could impact our view with regard to future realization of deferred tax assets. We continue to believe it is more likely than not that the benefit for certain foreign tax credits and state net operating loss carryforwards will not be realized. In recognition of this risk, we continue to provide a partial valuation allowance on the deferred tax assets relating to these carryforwards. Finally, as a result of the U.S. tax reserve release previously mentioned, we recorded additional capital loss carryforward deferred tax assets of $93 million . After assessing the positive and negative evidence surrounding our ability to realize these carryforwards before expiration, we established a full valuation allowance against these deferred tax assets.

Fair Value

Fair Value	6 Months Ended
	Jun. 30, 2016
Fair Value Disclosures [Abstract]
Fair Value Disclosures [Text Block]	Fair Value Fair Value Measurements For purposes of this disclosure, fair value is defined as the exchange price that would be received to sell an asset or paid to transfer a liability (exit price) in the principal or most advantageous market in an orderly transaction between market participants at the measurement date under current market conditions. Fair value is based on the assumptions we believe market participants would use when pricing an asset or liability. Additionally, entities are required to consider all aspects of nonperformance risk, including the entity’s own credit standing, when measuring the fair value of a liability. GAAP specifies a three-level hierarchy that is used when measuring and disclosing fair value. The fair value hierarchy gives the highest priority to quoted prices available in active markets (i.e., observable inputs) and the lowest priority to data lacking transparency (i.e., unobservable inputs). An instrument’s categorization within the fair value hierarchy is based on the lowest level of significant input to its valuation. The following is a description of the three hierarchy levels. Level 1 Inputs are quoted prices in active markets for identical assets or liabilities at the measurement date. Additionally, the entity must have the ability to access the active market, and the quoted prices cannot be adjusted by the entity. Level 2 Inputs are other than quoted prices included in Level 1 that are observable for the asset or liability, either directly or indirectly. Level 2 inputs include quoted prices in active markets for similar assets or liabilities; quoted prices in inactive markets for identical or similar assets or liabilities; or inputs that are observable or can be corroborated by observable market data by correlation or other means for substantially the full term of the assets or liabilities. Level 3 Unobservable inputs are supported by little or no market activity. The unobservable inputs represent management's best assumptions of how market participants would price the assets or liabilities. Generally, Level 3 assets and liabilities are valued using pricing models, discounted cash flow methodologies, or similar techniques that require significant judgment or estimation. Transfers Transfers into or out of any hierarchy level are recognized at the end of the reporting period in which the transfer occurred. There were no transfers between any levels for the six months ended June 30, 2016 . Following are descriptions of the valuation methodologies used to measure material assets and liabilities at fair value and details of the valuation models, key inputs to those models, and significant assumptions utilized. • Available-for-sale securities — All classes of available-for-sale securities are carried at fair value based on observable market prices, when available. If observable market prices are not available, our valuations are based on internally developed discounted cash flow models (an income approach) that use a market-based discount rate and consider recent market transactions, experience with similar securities, current business conditions, and analysis of the underlying collateral, as available. To estimate cash flows, we are required to utilize various significant assumptions including market observable inputs (e.g., forward interest rates) and internally developed inputs (including prepayment speeds, delinquency levels, and credit losses). • Interests retained in financial asset sales — Includes certain noncertificated interests retained from the sale of automotive finance receivables. Due to inactivity in the market, valuations are based on internally developed discounted cash flow models (an income approach) that use a market-based discount rate; therefore, we classified these assets as Level 3. The valuation considers recent market transactions, experience with similar assets, current business conditions, and analysis of the underlying collateral, as available. To estimate cash flows, we utilize various significant assumptions, including market observable inputs (e.g., forward interest rates) and internally developed inputs (e.g., prepayment speeds, delinquency levels, and credit losses). • Derivative instruments — We enter into a variety of derivative financial instruments as part of our risk management strategies. Certain of these derivatives are exchange traded, such as Eurodollar futures, options of Eurodollar futures, and equity options. To determine the fair value of these instruments, we utilize the quoted market prices for the particular derivative contracts; therefore, we classified these contracts as Level 1. We also execute over-the-counter (OTC) and centrally-cleared derivative contracts, such as interest rate swaps, a cross-currency swap, swaptions, foreign-currency denominated forward contracts, prepaid equity forward contracts, caps, floors, and agency to-be-announced securities. For OTC contracts, we utilize third-party-developed valuation models that are widely accepted in the market to value these OTC derivative contracts. The specific terms of the contract and market observable inputs (such as interest rate forward curves, interpolated volatility assumptions, or equity pricing) are used in the model. We classified these OTC derivative contracts as Level 2 because all significant inputs into these models were market observable. For centrally-cleared contracts, we utilize unadjusted prices obtained from the clearing house as the basis for valuation, and they are also classified as Level 2. We did not have any derivative instruments classified as Level 3 as of June 30, 2016 , or December 31, 2015 . We are required to consider all aspects of nonperformance risk, including our own credit standing, when measuring fair value of a liability. We reduce credit risk on the majority of our derivatives by entering into legally enforceable agreements that enable the posting and receiving of collateral associated with the fair value of our derivative positions on an ongoing basis. In the event that we do not enter into legally enforceable agreements that enable the posting and receiving of collateral, we will consider our credit risk and the credit risk of our counterparties in the valuation of derivative instruments through a credit valuation adjustment (CVA), if warranted. The CVA calculation utilizes the credit default swap spreads of the counterparty. Recurring Fair Value The following tables display the assets and liabilities measured at fair value on a recurring basis including financial instruments elected for the fair value option. We often economically hedge the fair value change of our assets or liabilities with derivatives and other financial instruments. The tables below display the hedges separately from the hedged items; therefore, they do not directly display the impact of our risk management activities. Recurring fair value measurements June 30, 2016 ($ in millions) Level 1 Level 2 Level 3 Total Assets Investment securities Available-for-sale securities Debt securities U.S. Treasury and federal agencies $ 275 $ — $ — $ 275 U.S. States and political subdivisions — 733 — 733 Foreign government 11 180 — 191 Mortgage-backed residential — 12,617 — 12,617 Mortgage-backed commercial — 506 — 506 Asset-backed — 1,674 — 1,674 Corporate debt — 1,602 — 1,602 Total debt securities 286 17,312 — 17,598 Equity securities (a) 599 — — 599 Total available-for-sale securities 885 17,312 — 18,197 Other assets Interests retained in financial asset sales — — 31 31 Derivative contracts in a receivable position (b) Interest rate 1 199 — 200 Foreign currency — 7 — 7 Other 2 — — 2 Total derivative contracts in a receivable position 3 206 — 209 Total assets $ 888 $ 17,518 $ 31 $ 18,437 Liabilities Accrued expenses and other liabilities Derivative contracts in a payable position (b) Interest rate $ — $ (79 ) $ — $ (79 ) Foreign currency — (2 ) — (2 ) Other (1 ) (5 ) — (6 ) Total derivative contracts in a payable position (1 ) (86 ) — (87 ) Total liabilities $ (1 ) $ (86 ) $ — $ (87 ) (a) Our investment in any one industry did not exceed 18% . (b) For additional information on derivative instruments and hedging activities, refer to Note 20 . Recurring fair value measurements December 31, 2015 ($ in millions) Level 1 Level 2 Level 3 Total Assets Investment securities Available-for-sale securities Debt securities U.S. Treasury and federal agencies $ 1,469 $ 272 $ — $ 1,741 U.S. States and political subdivisions — 716 — 716 Foreign government 10 167 — 177 Mortgage-backed residential — 10,366 — 10,366 Mortgage-backed commercial — 481 — 481 Asset-backed — 1,755 — 1,755 Corporate debt — 1,204 — 1,204 Total debt securities 1,479 14,961 — 16,440 Equity securities (a) 717 — — 717 Total available-for-sale securities 2,196 14,961 — 17,157 Other assets Interests retained in financial asset sales — — 40 40 Derivative contracts in a receivable position (b) Interest rate 2 229 — 231 Other 2 — — 2 Total derivative contracts in a receivable position 4 229 — 233 Total assets $ 2,200 $ 15,190 $ 40 $ 17,430 Liabilities Accrued expenses and other liabilities Derivative contracts in a payable position (b) Interest rate $ (2 ) $ (133 ) $ — $ (135 ) Foreign currency — (1 ) — (1 ) Other (1 ) (8 ) — (9 ) Total derivative contracts in a payable position (3 ) (142 ) — (145 ) Total liabilities $ (3 ) $ (142 ) $ — $ (145 ) (a) Our investment in any one industry did not exceed 14% . (b) For additional information on derivative instruments and hedging activities, refer to Note 20 . The following tables present the reconciliation for all Level 3 assets and liabilities measured at fair value on a recurring basis. We often economically hedge the fair value change of our assets or liabilities with derivatives and other financial instruments. The Level 3 items presented below may be hedged by derivatives and other financial instruments that are classified as Level 1 or Level 2. Thus, the following tables do not fully reflect the impact of our risk management activities. Level 3 recurring fair value measurements Net realized/unrealized Fair value at Net unrealized gains included in earnings ($ in millions) Fair value at April 1, 2016 included in earnings included in OCI Purchases Sales Issuances Settlements Assets Other assets Interests retained in financial asset sales $ 31 $ 1 (a) $ — $ — $ 2 $ — $ (3 ) $ 31 $ — Total assets $ 31 $ 1 $ — $ — $ 2 $ — $ (3 ) $ 31 $ — (a) Reported as other income, net of losses, in the Condensed Consolidated Statement of Comprehensive Income. Level 3 recurring fair value measurements Fair value at April 1, 2015 Net realized/unrealized gains Purchases Sales Issuances Settlements Fair value at Net unrealized gains included in earnings ($ in millions) included in earnings included in OCI Assets Mortgage loans held-for-sale, net $ 3 $ 1 (a) $ — $ — $ — $ — $ — $ 4 $ 1 Other assets Interests retained in financial asset sales 42 4 (a) — — — — (14 ) 32 — Total assets $ 45 $ 5 $ — $ — $ — $ — $ (14 ) $ 36 $ 1 (a) Reported as other income, net of losses, in the Condensed Consolidated Statement of Comprehensive Income. Level 3 recurring fair value measurements Net realized/unrealized Fair value at Net unrealized gains included in earnings ($ in millions) Fair value at Jan. 1, 2016 included in earnings included in OCI Purchases Sales Issuances Settlements Assets Other assets Interests retained in financial asset sales $ 40 $ 3 (a) $ — $ — $ 6 $ — $ (18 ) $ 31 $ — Total assets $ 40 $ 3 $ — $ — $ 6 $ — $ (18 ) $ 31 $ — (a) Reported as other income, net of losses, in the Condensed Consolidated Statement of Comprehensive Income. Level 3 recurring fair value measurements Fair value at Jan. 1, 2015 Net realized/unrealized Purchases Sales Issuances Settlements Fair value at Net unrealized gains included in earnings ($ in millions) included in earnings included in OCI Assets Mortgage loans held-for-sale, net $ 3 $ 1 (a) $ — $ — $ — $ — $ — $ 4 $ 1 Other assets Interests retained in financial asset sales 47 7 (a) — — — 1 (23 ) 32 — Total assets $ 50 $ 8 $ — $ — $ — $ 1 $ (23 ) $ 36 $ 1 (a) Reported as other income, net of losses, in the Condensed Consolidated Statement of Comprehensive Income. Nonrecurring Fair Value We may be required to measure certain assets and liabilities at fair value from time to time. These periodic fair value measures typically result from the application of lower-of-cost or fair value accounting or certain impairment measures. These items would constitute nonrecurring fair value measures. The following tables display the assets and liabilities measured at fair value on a nonrecurring basis. Nonrecurring Lower-of-cost or Total gain included in earnings for Total gain included in earnings for the six months ended June 30, 2016 ($ in millions) Level 1 Level 2 Level 3 Total Assets Loans held-for-sale, net $ — $ — $ 15 $ 15 $ — n/m (a) n/m (a) Commercial finance receivables and loans, net (b) Automotive — — 43 43 (6 ) n/m (a) n/m (a) Other — — 46 46 (18 ) n/m (a) n/m (a) Total commercial finance receivables and loans, net — — 89 89 (24 ) n/m (a) n/m (a) Other assets Repossessed and foreclosed assets (c) — — 10 10 (3 ) n/m (a) n/m (a) Other — — 5 5 — n/m (a) n/m (a) Total assets $ — $ — $ 119 $ 119 $ (27 ) n/m n/m n/m = not meaningful (a) We consider the applicable valuation or loan loss allowance to be the most relevant indicator of the impact on earnings caused by the fair value measurement. Accordingly, the table above excludes total gains and losses included in earnings for these items. The carrying values are inclusive of the respective valuation or loan loss allowance. (b) Represents the portion of the portfolio specifically impaired during 2016 . The related valuation allowance represents the cumulative adjustment to fair value of those specific receivables. (c) The allowance provided for repossessed and foreclosed assets represents any cumulative valuation adjustment recognized to adjust the assets to fair value. Nonrecurring Lower-of-cost or Total gain included in earnings for Total gain included in earnings for the six months ended June 30, 2015 ($ in millions) Level 1 Level 2 Level 3 Total Assets Loans held-for-sale, net Automotive $ — $ — $ 1,356 $ 1,356 $ (12 ) n/m (a) n/m (a) Mortgage — — 10 10 (1 ) n/m (a) n/m (a) Other — — 36 36 — n/m (a) n/m (a) Total loans held-for-sale, net — — 1,402 1,402 (13 ) n/m (a) n/m (a) Commercial finance receivables and loans, net (b) Automotive — — 24 24 (8 ) n/m (a) n/m (a) Other — — 34 34 (11 ) n/m (a) n/m (a) Total commercial finance receivables and loans, net — — 58 58 (19 ) n/m (a) n/m (a) Other assets Repossessed and foreclosed assets (c) — — 10 10 (3 ) n/m (a) n/m (a) Other — — 2 2 — n/m (a) n/m (a) Total assets $ — $ — $ 1,472 $ 1,472 $ (35 ) n/m n/m n/m = not meaningful (a) We consider the applicable valuation or loan loss allowance to be the most relevant indicator of the impact on earnings caused by the fair value measurement. Accordingly, the table above excludes total gains and losses included in earnings for these items. The carrying values are inclusive of the respective valuation or loan loss allowance. (b) Represents the portion of the portfolio specifically impaired during 2015 . The related valuation allowance represents the cumulative adjustment to fair value of those specific receivables. (c) The allowance provided for repossessed and foreclosed assets represents any cumulative valuation adjustment recognized to adjust the assets to fair value. The following table presents quantitative information regarding the significant unobservable inputs used in significant Level 3 assets measured at fair value on a nonrecurring basis. June 30, 2015 ( $ in millions ) Level 3 nonrecurring measurements Valuation technique Unobservable input Weighted average/range Assets Automotive loans held-for-sale, net $ 1,356 Discounted cash flow Prepayment rate 1.30% Gross loss 0-4.50% Credit spread 0-6.70% Fair Value Option for Financial Assets We elected the fair value option for an insignificant amount of conforming and government-insured mortgage loans held-for-sale. We elected the fair value option to mitigate earnings volatility by better matching the accounting for the assets with the related hedges. Our intent in electing fair value measurement was to mitigate a divergence between accounting losses and economic exposure for certain assets and liabilities. Fair Value of Financial Instruments The following table presents the carrying and estimated fair value of financial instruments, except for those recorded at fair value on a recurring basis presented in the previous section of this note titled Recurring Fair Value. When possible, we use quoted market prices to determine fair value. Where quoted market prices are not available, the fair value is internally derived based on appropriate valuation methodologies with respect to the amount and timing of future cash flows and estimated discount rates. However, considerable judgment is required in interpreting current market data to develop the market assumptions and inputs necessary to estimate fair value. As such, the actual amount received to sell an asset or the amount paid to settle a liability could differ from our estimates. Fair value information presented herein was based on information available at June 30, 2016 , and December 31, 2015 . Estimated fair value ($ in millions) Carrying value Level 1 Level 2 Level 3 Total June 30, 2016 Financial assets Held-to-maturity securities $ 571 $ — $ 579 $ — $ 579 Loans held-for-sale, net 15 — — 15 15 Finance receivables and loans, net 111,564 — — 112,632 112,632 Nonmarketable equity investments 772 — 745 43 788 Financial liabilities Deposit liabilities $ 72,802 $ — $ — $ 73,528 $ 73,528 Short-term borrowings 5,994 — — 5,996 5,996 Long-term debt 61,040 — 23,407 39,574 62,981 December 31, 2015 Financial assets Loans held-for-sale, net $ 105 $ — $ — $ 105 $ 105 Finance receivables and loans, net 110,546 — — 110,737 110,737 Nonmarketable equity investments 418 — 391 42 433 Financial liabilities Deposit liabilities $ 66,478 $ — $ — $ 66,889 $ 66,889 Short-term borrowings 8,101 — — 8,102 8,102 Long-term debt 66,234 — 23,018 45,157 68,175 The following describes the methodologies and assumptions used to determine fair value for the significant classes of financial instruments. In addition to the valuation methods discussed below, we also followed guidelines for determining whether a market was not active and a transaction was not distressed. We assumed the price that would be received in an orderly transaction (including a market-based return) and not in forced liquidation or distressed sale. • Cash and cash equivalents — Included in cash and cash equivalents are highly liquid investments that are readily convertible to known amounts of cash and which are subject to an insignificant risk of change in value due to interest rate, quoted price, or penalty on withdrawal. Classified as Level 1 under the fair value hierarchy, cash and cash equivalents generally expose us to limited credit risk and are so near maturity that they present insignificant risk of changes in value because of changes in interest rates. Accordingly, the carrying value approximates the fair value of these instruments. • Held-to-maturity securities — Held-to-maturity securities, which consist of residential mortgage-backed debt securities issued by government agencies, are carried at amortized cost. For fair value disclosure purposes, held-to-maturity securities are classified as Level 2, with fair value based on observable market prices, when available. • Finance receivables and loans, net — With the exception of mortgage loans held-for-investment, the fair value of finance receivables and loans was based on discounted future cash flows using applicable spreads to approximate current rates applicable to each category of finance receivables and loans (an income approach using Level 3 inputs). The carrying value of commercial receivables in certain markets and certain automotive and other receivables for which interest rates reset on a short-term basis with applicable market indices are assumed to approximate fair value either because of the short-term nature or because of the interest rate adjustment feature. The fair value of commercial receivables in other markets was based on discounted future cash flows using applicable spreads to approximate current rates applicable to similar assets in those markets. The fair value of mortgage loans held-for-investment was based on a discounted cash flow basis utilizing cash flow projections from internally developed models that utilized prepayment, default, and discount rate assumptions. These valuations consider unique attributes of the loans such as geography, delinquency status, product type, and other factors. • Nonmarketable equity investments — Nonmarketable equity investments primarily include investments in FHLB and FRB stock and other equity investments carried at cost. As a member of the FHLB and FRB, Ally Bank is required to hold FHLB and FRB stock. The stock can be sold only to the FHLB and FRB upon termination of membership, or redeemed at the sole discretion of the FHLB and FRB, respectively. The fair value of FHLB and FRB stock is equal to the stock’s par value since the stock is bought, sold, and/or redeemed at par. FHLB and FRB stock is carried at cost, which generally represents the stock’s par value. • Deposit liabilities — Deposit liabilities represent certain consumer and brokered bank deposits, mortgage escrow deposits, and dealer deposits. The fair value of deposits at Level 3 were estimated by discounting projected cash flows based on discount factors derived from the forward interest rate swap curve. • Short-term borrowings and Long-term debt — Level 2 debt was valued using quoted market prices for similar instruments, when available, or other means for substantiation with observable inputs. Debt valued by discounting projected cash flows using internally derived inputs, such as prepayment speeds and discount rates, was classified as Level 3. • Financial instruments for which carrying value approximates fair value — Certain financial instruments that are not carried at fair value on the consolidated balance sheet are carried at amounts that approximate fair value primarily due to their short term nature and limited credit risk. These instruments include restricted cash, cash collateral, accrued interest receivable, accrued interest payable, trade receivables and payables, and other short term receivables and payables.

Offsetting Assets and Liabiliti

Offsetting Assets and Liabilities	6 Months Ended
	Jun. 30, 2016
Offsetting [Abstract]
Assets and Liabilities Subject to Enforceable Master Netting Arrangements [Text Block]	Offsetting Assets and Liabilities Our derivative contracts and repurchase/reverse repurchase transactions are supported by qualifying master netting and master repurchase agreements. These agreements are legally enforceable bilateral agreements that (1) create a single legal obligation for all individual transactions covered by the agreement to the nondefaulting entity upon an event of default of the counterparty, including bankruptcy, insolvency, or similar proceeding, and (2) provide the nondefaulting entity the right to accelerate, terminate, and close-out on a net basis all transactions under the agreement and to liquidate or set off collateral promptly upon an event of default of the counterparty. To further mitigate the risk of counterparty default related to derivative instruments, we maintain collateral agreements with certain counterparties. The agreements require both parties to maintain collateral in the event the fair values of the derivative financial instruments meet established thresholds. In the event that either party defaults on the obligation, the secured party may seize the collateral. Generally, our collateral arrangements are bilateral such that we and the counterparty post collateral for the value of our total obligation to each other. Contractual terms provide for standard and customary exchange of collateral based on changes in the market value of the outstanding derivatives. The securing party posts additional collateral when their obligation rises or removes collateral when it falls, such that the net replacement cost of the nondefaulting party is covered in the event of counterparty default. In certain instances as it relates to our derivative instruments, we have the option to report derivative assets and liabilities as well as assets and liabilities associated with cash collateral received or delivered that is governed by a master netting agreement on a net basis as long as certain qualifying criteria are met. Similarly, for our repurchase/reverse repurchase transactions, we have the option to report recognized assets and liabilities subject to a master netting agreement on a net basis if certain qualifying criteria are met. At June 30, 2016 , these instruments are reported as gross assets and gross liabilities on the Condensed Consolidated Balance Sheet . The composition of offsetting derivative instruments, financial assets, and financial liabilities was as follows. Gross amounts of recognized assets/(liabilities) Gross amounts offset in the Condensed Consolidated Balance Sheet Net amounts of assets/(liabilities) Gross amounts not offset in the Condensed Consolidated Balance Sheet June 30, 2016 ( $ in millions ) Financial instruments Collateral (a) (b) (c) Net amount Assets Derivative assets in net asset positions $ 207 $ — $ 207 $ (44 ) $ (143 ) $ 20 Derivative assets in net liability positions 2 — 2 (1 ) — 1 Total assets (d) $ 209 $ — $ 209 $ (45 ) $ (143 ) $ 21 Liabilities Derivative liabilities in net liability positions $ (38 ) $ — $ (38 ) $ 1 $ 21 $ (16 ) Derivative liabilities in net asset positions (44 ) — (44 ) 44 — — Derivative liabilities with no offsetting arrangements (5 ) — (5 ) — — (5 ) Total derivative liabilities (d) (87 ) — (87 ) 45 21 (21 ) Securities sold under agreements to repurchase (e) (468 ) — (468 ) — 468 — Total liabilities $ (555 ) $ — $ (555 ) $ 45 $ 489 $ (21 ) (a) Financial collateral received/pledged shown as a balance based on the sum of all net asset and liability positions between Ally and each individual derivative counterparty. (b) Amounts disclosed are limited to the financial asset or liability balance and, accordingly, exclude excess collateral received or pledged and noncash collateral received. $2 million of noncash derivative collateral pledged to us was excluded at June 30, 2016 . We do not record such collateral received on our Condensed Consolidated Balance Sheet unless certain conditions are met. (c) Certain agreements grant us the right to sell or pledge the noncash assets we receive as collateral. Noncash collateral pledged to us where the agreement grants us the right to sell or pledge the underlying assets had a fair value of $2 million at June 30, 2016 . We have not sold or pledged any of the noncash collateral received under these agreements as of June 30, 2016 . (d) For additional information on derivative instruments and hedging activities, refer to Note 20 . (e) For additional information on securities sold under agreements to repurchase, refer to Note 13 . Gross amounts of recognized assets/(liabilities) Gross amounts offset in the Condensed Consolidated Balance Sheet Net amounts of assets/(liabilities) Gross amounts not offset in the Condensed Consolidated Balance Sheet December 31, 2015 ( $ in millions ) Financial instruments Collateral Net amount Assets Derivative assets in net asset positions $ 224 $ — $ 224 $ (69 ) $ (67 ) $ 88 Derivative assets in net liability positions 9 — 9 (9 ) — — Total assets (d) $ 233 $ — $ 233 $ (78 ) $ (67 ) $ 88 Liabilities Derivative liabilities in net liability positions $ (68 ) $ — $ (68 ) $ 9 $ 2 $ (57 ) Derivative liabilities in net asset positions (69 ) — (69 ) 69 — — Derivative liabilities with no offsetting arrangements (8 ) — (8 ) — — (8 ) Total derivative liabilities (d) (145 ) — (145 ) 78 2 (65 ) Securities sold under agreements to repurchase (e) (648 ) — (648 ) — 648 — Total liabilities $ (793 ) $ — $ (793 ) $ 78 $ 650 $ (65 ) (a) Financial collateral received/pledged shown as a balance based on the sum of all net asset and liability positions between Ally and each individual derivative counterparty. (b) Amounts disclosed are limited to the financial asset or liability balance and, accordingly, exclude excess collateral received or pledged and noncash collateral received. $7 million of noncash derivative collateral pledged to us was excluded at December 31, 2015. We do not record such collateral received on our Consolidated Balance Sheet unless certain conditions are met. (c) Certain agreements grant us the right to sell or pledge the noncash assets we receive as collateral. Noncash collateral pledged to us where the agreement grants us the right to sell or pledge the underlying assets had a fair value of $7 million at December 31, 2015. We have not sold or pledged any of the noncash collateral received under these agreements as of December 31, 2015. (d) For additional information on derivative instruments and hedging activities, refer to Note 20 . (e) For additional information on securities sold under agreements to repurchase, refer to Note 13 .

Segment And Geographic Informat

Segment And Geographic Information	6 Months Ended
	Jun. 30, 2016
Segment Reporting [Abstract]
Segment Reporting Disclosure [Text Block]	Segment and Geographic Information Operating segments are defined as components of an enterprise that engage in business activity from which revenues are earned and expenses incurred for which discrete financial information is available that is evaluated regularly by our chief operating decision maker in deciding how to allocate resources and in assessing performance. Change in Reportable Segments As a result of a change in how management views and operates our business, during the first quarter of 2016, we made changes in the composition of our operating segments. Financial information related to our Corporate Finance business is presented as a separate reportable segment. Previously, all such activity was included in Corporate and Other. Additionally, only the activity of our ongoing bulk acquisitions of mortgage loans and other originations and refinancing is presented in Mortgage Finance operations. The activity related to the management of our legacy mortgage portfolio is included in Corporate and Other. Our other operating segments, Automotive Finance operations and Insurance operations, were unchanged. Amounts for 2015 have been adjusted to conform to the current management view. We report our results of operations on a line-of-business basis through four operating segments: Automotive Finance operations, Insurance operations, Mortgage Finance operations, and Corporate Finance operations, with the remaining activity reported in Corporate and Other. The operating segments are determined based on the products and services offered, and reflect the manner in which financial information is currently evaluated by management. The following is a description of each of our reportable operating segments. Automotive Finance operations — Provides automotive financing services to consumers and automotive dealers. Our automotive financing services include providing retail installment sales financing, loans, and leases; offering term loans to dealers, financing dealer floorplans and other lines of credit to dealers; fleet financing, and vehicle remarketing services. Insurance operations — Offers both consumer finance protection and insurance products sold primarily through the automotive dealer channel, and commercial insurance products sold to dealers. As part of our focus on offering dealers a broad range of consumer financial and insurance products, we provide vehicle service contracts, maintenance coverage, and guaranteed asset protection products. We also underwrite selected commercial insurance coverages, which primarily insure dealers' vehicle inventories. Mortgage Finance operations — Includes the management of a held-for-investment consumer mortgage finance loan portfolio and is primarily comprised of high-quality jumbo and low-to-moderate income mortgage loans purchased or originated after January 1, 2009. Corporate Finance operations — Provides senior secured leveraged cash flow and asset-based loans primarily to U.S.-based middle market companies. The loans are used to support leveraged buyouts, mergers and acquisitions, debt refinancing, restructurings, and working capital. Corporate and Other primarily consists of activity related to centralized corporate treasury activities such as management of the cash and corporate investment securities and loan portfolios, short- and long-term debt, retail and brokered deposit liabilities, derivative instruments, the amortization of the discount associated with new debt issuances and bond exchanges, and the residual impacts of our corporate funds-transfer pricing (FTP) and treasury asset liability management (ALM) activities. Corporate and Other also includes certain equity investments, the management of our legacy mortgage portfolio, and reclassifications and eliminations between the reportable operating segments. Additionally, financial information related to TradeKing for June 2016 is included within Corporate and Other. We utilize an FTP methodology for the majority of our business operations. The FTP methodology assigns charge rates and credit rates to classes of assets and liabilities based on expected duration and the benchmark rate curve plus an assumed credit spread. Matching duration allocates interest income and interest expense to these reportable segments so their respective results are insulated from interest rate risk. This methodology is consistent with our ALM practices, which includes managing interest rate risk centrally at a corporate level. The net residual impact of the FTP methodology is included within the results of Corporate and Other. The information presented in our reportable operating segments and geographic areas tables that follow are based in part on internal allocations, which involve management judgment. Financial information for our reportable operating segments is summarized as follows. Three months ended June 30, ($ in millions) Automotive Finance operations Insurance operations Mortgage Finance operations Corporate Finance operations Corporate and Other Consolidated (a) 2016 Net financing revenue (loss) $ 929 $ 16 $ 26 $ 29 $ (16 ) $ 984 Other revenue 77 259 — 4 34 374 Total net revenue 1,006 275 26 33 18 1,358 Provision for loan losses 170 — — 3 (1 ) 172 Total noninterest expense 410 293 17 16 37 773 Income (loss) from continuing operations before income tax expense $ 426 $ (18 ) $ 9 $ 14 $ (18 ) $ 413 Total assets $ 112,356 $ 7,193 $ 8,014 $ 2,989 $ 27,379 $ 157,931 2015 Net financing revenue $ 850 $ 14 $ 11 $ 22 $ 19 $ 916 Other revenue (loss) 55 268 — 6 (118 ) 211 Total net revenue (loss) 905 282 11 28 (99 ) 1,127 Provision for loan losses 132 — 4 4 — 140 Total noninterest expense 400 267 10 14 33 724 Income (loss) from continuing operations before income tax expense $ 373 $ 15 $ (3 ) $ 10 $ (132 ) $ 263 Total assets $ 113,607 $ 7,260 $ 5,623 $ 2,132 $ 27,656 $ 156,278 (a) Net financing revenue after the provision for loan losses totaled $812 million and $776 million for the three months ended June 30, 2016 , and 2015 , respectively. Six months ended June 30, ($ in millions) Automotive Finance operations Insurance operations Mortgage Finance operations Corporate Finance operations Corporate and Other Consolidated (a) 2016 Net financing revenue (loss) $ 1,825 $ 30 $ 46 $ 57 $ (23 ) $ 1,935 Other revenue 154 513 — 10 73 750 Total net revenue 1,979 543 46 67 50 2,685 Provision for loan losses 379 — 3 9 1 392 Total noninterest expense 837 511 32 33 70 1,483 Income (loss) from continuing operations before income tax expense $ 763 $ 32 $ 11 $ 25 $ (21 ) $ 810 Total assets $ 112,356 $ 7,193 $ 8,014 $ 2,989 $ 27,379 $ 157,931 2015 Net financing revenue $ 1,659 $ 26 $ 22 $ 42 $ 17 $ 1,766 Other revenue (loss) 107 536 — 12 (201 ) 454 Total net revenue (loss) 1,766 562 22 54 (184 ) 2,220 Provision for loan losses 259 — 6 (1 ) (8 ) 256 Total noninterest expense 828 469 18 28 76 1,419 Income (loss) from continuing operations before income tax expense $ 679 $ 93 $ (2 ) $ 27 $ (252 ) $ 545 Total assets $ 113,607 $ 7,260 $ 5,623 $ 2,132 $ 27,656 $ 156,278 (a) Net financing revenue after the provision for loan losses totaled $1,543 million and $1,510 million for the six months ended June 30, 2016 , and 2015 , respectively. Information concerning principal geographic areas was as follows. Three months ended June 30, ($ in millions) Revenue (a) Income Net income (loss) (b) 2016 Canada $ 24 $ 12 $ 10 Europe — — (2 ) Total foreign (c) 24 12 8 Total domestic (d) 1,334 401 352 Total $ 1,358 $ 413 $ 360 2015 Canada $ 28 $ 13 $ 13 Europe — — 17 Total foreign (c) 28 13 30 Total domestic (d) 1,099 250 152 Total $ 1,127 $ 263 $ 182 (a) Revenue consists of net financing revenue and total other revenue as presented in our Condensed Consolidated Financial Statements . (b) Gain (loss) realized on sale of discontinued operations are allocated to the geographic area in which the business operated. (c) Our foreign operations as of June 30, 2016 , and June 30, 2015 , consist of our ongoing Insurance operations in Canada and our remaining international entities in wind-down. (d) Amounts include eliminations between our domestic and foreign operations. Six months ended June 30, ($ in millions) Revenue (a) Income Net income (loss) (b) 2016 Canada $ 45 $ 22 $ 18 Europe — — (3 ) Total foreign (c) 45 22 15 Total domestic (d) 2,640 788 595 Total $ 2,685 $ 810 $ 610 2015 Canada $ 52 $ 24 $ 21 Europe 1 4 28 Asia-Pacific — — 452 Total foreign (c) 53 28 501 Total domestic (d) 2,167 517 257 Total $ 2,220 $ 545 $ 758 (a) Revenue consists of net financing revenue and total other revenue as presented in our Condensed Consolidated Financial Statements . (b) Gain (loss) realized on sale of discontinued operations are allocated to the geographic area in which the business operated. (c) Our foreign operations as of June 30, 2016 , and June 30, 2015 , consist of our ongoing Insurance operations in Canada and our remaining international entities in wind-down. (d) Amounts include eliminations between our domestic and foreign operations.

Parent And Guarantor Consolidat

Parent And Guarantor Consolidating Financial Statements	6 Months Ended
	Jun. 30, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Condensed Guarantor Financial Statements [Text Block]	Parent and Guarantor Condensed Consolidating Financial Statements Certain of our senior notes issued by the parent are guaranteed by 100% directly owned subsidiaries of Ally (the Guarantors). As of June 30, 2016 , the Guarantors include Ally US LLC and IB Finance Holding Company, LLC (IB Finance), each of which fully and unconditionally guarantee the senior notes on a joint and several basis. The following financial statements present condensed consolidating financial data for (i) Ally Financial Inc. (on a parent company-only basis); (ii) the Guarantors; (iii) the nonguarantor subsidiaries (all other subsidiaries); and (iv) an elimination column for adjustments to arrive at (v) the information for the parent company, the Guarantors, and nonguarantors on a consolidated basis. Investments in subsidiaries are accounted for by the parent company and the Guarantors using the equity-method for this presentation. Results of operations of subsidiaries are therefore classified in the parent company’s and Guarantors’ investment in subsidiaries accounts. The elimination entries set forth in the following condensed consolidating financial statements eliminate distributed and undistributed income of subsidiaries, investments in subsidiaries, and intercompany balances and transactions between the parent, the Guarantors, and nonguarantors. Condensed Consolidating Statements of Comprehensive Income Three months ended June 30, 2016 ($ in millions) Parent Guarantors Nonguarantors Consolidating adjustments Ally consolidated Financing revenue and other interest income Interest and fees on finance receivables and loans $ (28 ) $ — $ 1,293 $ — $ 1,265 Interest and fees on finance receivables and loans — intercompany 3 — 2 (5 ) — Interest and dividends on investment securities — — 99 — 99 Interest on cash and cash equivalents 1 — 3 — 4 Interest-bearing cash — intercompany — — 2 (2 ) — Operating leases 5 — 696 — 701 Total financing revenue and other interest income (19 ) — 2,095 (7 ) 2,069 Interest expense Interest on deposits 2 — 201 — 203 Interest on short-term borrowings 10 — 2 — 12 Interest on long-term debt 290 — 146 — 436 Interest on intercompany debt 4 — 3 (7 ) — Total interest expense 306 — 352 (7 ) 651 Depreciation expense on operating lease assets 3 — 431 — 434 Net financing (loss) revenue (328 ) — 1,312 — 984 Cash dividends from subsidiaries Nonbank subsidiaries 148 — — (148 ) — Other revenue Insurance premiums and service revenue earned — — 236 — 236 (Loss) gain on mortgage and automotive loans, net (2 ) — 5 — 3 Other gain on investments, net — — 39 — 39 Other income, net of losses 317 — 214 (435 ) 96 Total other revenue 315 — 494 (435 ) 374 Total net revenue 135 — 1,806 (583 ) 1,358 Provision for loan losses 88 — 84 — 172 Noninterest expense Compensation and benefits expense 139 — 103 — 242 Insurance losses and loss adjustment expenses — — 145 — 145 Other operating expenses 317 — 502 (433 ) 386 Total noninterest expense 456 — 750 (433 ) 773 (Loss) income from continuing operations before income tax (benefit) expense and undistributed income (loss) of subsidiaries (409 ) — 972 (150 ) 413 Income tax (benefit) expense from continuing operations (65 ) (82 ) 203 — 56 Net (loss) income from continuing operations (344 ) 82 769 (150 ) 357 Income from discontinued operations, net of tax 3 — — — 3 Undistributed income (loss) of subsidiaries Bank subsidiary 336 336 — (672 ) — Nonbank subsidiaries 365 (2 ) — (363 ) — Net income 360 416 769 (1,185 ) 360 Other comprehensive income, net of tax 120 62 91 (153 ) 120 Comprehensive income $ 480 $ 478 $ 860 $ (1,338 ) $ 480 Three months ended June 30, 2015 ($ in millions) Parent Guarantors Nonguarantors Consolidating adjustments Ally consolidated Financing revenue and other interest income Interest and fees on finance receivables and loans $ (16 ) $ — $ 1,134 $ — $ 1,118 Interest and fees on finance receivables and loans — intercompany 2 — 5 (7 ) — Interest on loans held-for-sale — — 14 — 14 Interest and dividends on investment securities — — 93 — 93 Interest on cash and cash equivalents 1 — 1 — 2 Interest-bearing cash — intercompany — — 2 (2 ) — Operating leases — — 860 — 860 Total financing revenue and other interest income (13 ) — 2,109 (9 ) 2,087 Interest expense Interest on deposits 2 — 175 — 177 Interest on short-term borrowings 10 — 2 — 12 Interest on long-term debt 292 — 127 — 419 Interest on intercompany debt 6 — 3 (9 ) — Total interest expense 310 — 307 (9 ) 608 Depreciation expense on operating lease assets — — 563 — 563 Net financing (loss) revenue (323 ) — 1,239 — 916 Cash dividends from subsidiaries Bank subsidiaries 400 400 — (800 ) — Nonbank subsidiaries 248 — — (248 ) — Other revenue Insurance premiums and service revenue earned — — 237 — 237 Gain on mortgage and automotive loans, net — — 1 — 1 Loss on extinguishment of debt (156 ) — — — (156 ) Other gain on investments, net — — 45 — 45 Other income, net of losses 327 — 334 (577 ) 84 Total other revenue 171 — 617 (577 ) 211 Total net revenue 496 400 1,856 (1,625 ) 1,127 Provision for loan losses (36 ) — 176 — 140 Noninterest expense Compensation and benefits expense 139 — 197 (100 ) 236 Insurance losses and loss adjustment expenses — — 122 — 122 Other operating expenses 310 — 533 (477 ) 366 Total noninterest expense 449 — 852 (577 ) 724 Income from continuing operations before income tax (benefit) expense and undistributed (loss) income of subsidiaries 83 400 828 (1,048 ) 263 Income tax (benefit) expense from continuing operations (87 ) — 181 — 94 Net income from continuing operations 170 400 647 (1,048 ) 169 (Loss) income from discontinued operations, net of tax (15 ) — 28 — 13 Undistributed (loss) income of subsidiaries Bank subsidiary (132 ) (132 ) — 264 — Nonbank subsidiaries 159 — — (159 ) — Net income 182 268 675 (943 ) 182 Other comprehensive loss, net of tax (148 ) (67 ) (166 ) 233 (148 ) Comprehensive income $ 34 $ 201 $ 509 $ (710 ) $ 34 Six months ended June 30, 2016 ($ in millions) Parent Guarantors Nonguarantors Consolidating adjustments Ally consolidated Financing revenue and other interest income Interest and fees on finance receivables and loans $ (66 ) $ — $ 2,566 $ — $ 2,500 Interest and fees on finance receivables and loans — intercompany 6 — 4 (10 ) — Interest and dividends on investment securities — — 201 — 201 Interest on cash and cash equivalents 2 — 5 — 7 Interest-bearing cash — intercompany — — 5 (5 ) — Operating leases 10 — 1,460 — 1,470 Total financing revenue and other interest income (48 ) — 4,241 (15 ) 4,178 Interest expense Interest on deposits 4 — 392 — 396 Interest on short-term borrowings 20 — 5 — 25 Interest on long-term debt 578 — 300 — 878 Interest on intercompany debt 9 — 6 (15 ) — Total interest expense 611 — 703 (15 ) 1,299 Depreciation expense on operating lease assets 7 — 937 — 944 Net financing (loss) revenue (666 ) — 2,601 — 1,935 Cash dividends from subsidiaries Nonbank subsidiaries 629 — — (629 ) — Other revenue Insurance premiums and service revenue earned — — 466 — 466 (Loss) gain on mortgage and automotive loans, net (5 ) — 9 — 4 Loss on extinguishment of debt (2 ) — (2 ) — (4 ) Other gain on investments, net — — 93 — 93 Other income, net of losses 690 — 430 (929 ) 191 Total other revenue 683 — 996 (929 ) 750 Total net revenue 646 — 3,597 (1,558 ) 2,685 Provision for loan losses 148 — 244 — 392 Noninterest expense Compensation and benefits expense 286 — 208 — 494 Insurance losses and loss adjustment expenses — — 218 — 218 Other operating expenses 656 — 1,044 (929 ) 771 Total noninterest expense 942 — 1,470 (929 ) 1,483 (Loss) income from continuing operations before income tax (benefit) expense and undistributed income (loss) of subsidiaries (444 ) — 1,883 (629 ) 810 Income tax (benefit) expense from continuing operations (108 ) (82 ) 396 — 206 Net (loss) income from continuing operations (336 ) 82 1,487 (629 ) 604 Income (loss) from discontinued operations, net of tax 9 — (3 ) — 6 Undistributed income (loss) of subsidiaries Bank subsidiary 607 607 — (1,214 ) — Nonbank subsidiaries 330 (2 ) — (328 ) — Net income 610 687 1,484 (2,171 ) 610 Other comprehensive income, net of tax 266 145 243 (388 ) 266 Comprehensive income $ 876 $ 832 $ 1,727 $ (2,559 ) $ 876 Six months ended June 30, 2015 ($ in millions) Parent Guarantors Nonguarantors Consolidating adjustments Ally consolidated Financing revenue and other interest income Interest and fees on finance receivables and loans $ (12 ) $ — $ 2,204 $ — $ 2,192 Interest and fees on finance receivables and loans — intercompany 12 — 21 (33 ) — Interest on loans held-for-sale — — 38 — 38 Interest and dividends on investment securities — — 181 — 181 Interest on cash and cash equivalents 1 — 3 — 4 Interest-bearing cash — intercompany — — 4 (4 ) — Operating leases — — 1,756 — 1,756 Total financing revenue and other interest income 1 — 4,207 (37 ) 4,171 Interest expense Interest on deposits 5 — 344 — 349 Interest on short-term borrowings 20 — 3 — 23 Interest on long-term debt 584 — 264 — 848 Interest on intercompany debt 25 — 12 (37 ) — Total interest expense 634 — 623 (37 ) 1,220 Depreciation expense on operating lease assets — — 1,185 — 1,185 Net financing (loss) revenue (633 ) — 2,399 — 1,766 Cash dividends from subsidiaries Bank subsidiaries 525 525 — (1,050 ) — Nonbank subsidiaries 486 — — (486 ) — Other revenue Insurance premiums and service revenue earned — — 470 — 470 (Loss) gain on mortgage and automotive loans, net (8 ) — 55 — 47 Loss on extinguishment of debt (353 ) — (1 ) — (354 ) Other gain on investments, net — — 100 — 100 Other income, net of losses 678 — 690 (1,177 ) 191 Total other revenue 317 — 1,314 (1,177 ) 454 Total net revenue 695 525 3,713 (2,713 ) 2,220 Provision for loan losses 64 — 192 — 256 Noninterest expense Compensation and benefits expense 293 — 422 (224 ) 491 Insurance losses and loss adjustment expenses — — 178 — 178 Other operating expenses 620 — 1,083 (953 ) 750 Total noninterest expense 913 — 1,683 (1,177 ) 1,419 (Loss) income from continuing operations before income tax (benefit) expense and undistributed income of subsidiaries (282 ) 525 1,838 (1,536 ) 545 Income tax (benefit) expense from continuing operations (202 ) — 399 — 197 Net (loss) income from continuing operations (80 ) 525 1,439 (1,536 ) 348 Income from discontinued operations, net of tax 372 — 38 — 410 Undistributed income of subsidiaries Bank subsidiary 48 48 — (96 ) — Nonbank subsidiaries 418 — — (418 ) — Net income 758 573 1,477 (2,050 ) 758 Other comprehensive loss, net of tax (117 ) (25 ) (119 ) 144 (117 ) Comprehensive income $ 641 $ 548 $ 1,358 $ (1,906 ) $ 641 Condensed Consolidating Balance Sheet June 30, 2016 ($ in millions) Parent (a) Guarantors Nonguarantors (a) Consolidating adjustments Ally consolidated Assets Cash and cash equivalents Noninterest-bearing $ 796 $ — $ 994 $ — $ 1,790 Interest-bearing 700 — 3,241 — 3,941 Interest-bearing — intercompany — — 839 (839 ) — Total cash and cash equivalents 1,496 — 5,074 (839 ) 5,731 Available-for-sale securities — — 18,197 — 18,197 Held-to-maturity securities — — 571 — 571 Loans held-for-sale, net — — 15 — 15 Finance receivables and loans, net Finance receivables and loans, net 3,162 — 109,491 — 112,653 Intercompany loans to Bank subsidiary 1,400 — — (1,400 ) — Nonbank subsidiaries 2,319 — 561 (2,880 ) — Allowance for loan losses (76 ) — (1,013 ) — (1,089 ) Total finance receivables and loans, net 6,805 — 109,039 (4,280 ) 111,564 Investment in operating leases, net 59 — 13,696 — 13,755 Intercompany receivables from Bank subsidiary 293 — — (293 ) — Nonbank subsidiaries 91 — 124 (215 ) — Investment in subsidiaries Bank subsidiary 17,257 17,257 — (34,514 ) — Nonbank subsidiaries 10,837 1 — (10,838 ) — Premiums receivable and other insurance assets — — 1,868 (24 ) 1,844 Other assets 4,537 — 4,612 (2,895 ) 6,254 Total assets $ 41,375 $ 17,258 $ 153,196 $ (53,898 ) $ 157,931 Liabilities Deposit liabilities Noninterest-bearing $ — $ — $ 94 $ — $ 94 Interest-bearing 200 — 72,508 — 72,708 Total deposit liabilities 200 — 72,602 — 72,802 Short-term borrowings 3,576 — 2,418 — 5,994 Long-term debt 21,625 — 39,415 — 61,040 Intercompany debt to Nonbank subsidiaries 1,400 — 3,719 (5,119 ) — Intercompany payables to Bank subsidiary 203 — — (203 ) — Nonbank subsidiaries 164 — 165 (329 ) — Interest payable 251 — 176 — 427 Unearned insurance premiums and service revenue — — 2,465 — 2,465 Accrued expenses and other liabilities 345 — 4,142 (2,895 ) 1,592 Total liabilities 27,764 — 125,102 (8,546 ) 144,320 Total equity 13,611 17,258 28,094 (45,352 ) 13,611 Total liabilities and equity $ 41,375 $ 17,258 $ 153,196 $ (53,898 ) $ 157,931 (a) Amounts presented are based upon the legal transfer of the underlying assets to VIEs in order to reflect legal ownership. December 31, 2015 ($ in millions) Parent (a) Guarantors Nonguarantors (a) Consolidating adjustments Ally consolidated Assets Cash and cash equivalents Noninterest-bearing $ 1,234 $ — $ 914 $ — $ 2,148 Interest-bearing 401 — 3,831 — 4,232 Interest-bearing — intercompany — — 850 (850 ) — Total cash and cash equivalents 1,635 — 5,595 (850 ) 6,380 Available-for-sale securities — — 17,157 — 17,157 Loans held-for-sale, net — — 105 — 105 Finance receivables and loans, net Finance receivables and loans, net 2,636 — 108,964 — 111,600 Intercompany loans to Bank subsidiary 600 — — (600 ) — Nonbank subsidiaries 3,277 — 559 (3,836 ) — Allowance for loan losses (72 ) — (982 ) — (1,054 ) Total finance receivables and loans, net 6,441 — 108,541 (4,436 ) 110,546 Investment in operating leases, net 81 — 16,190 — 16,271 Intercompany receivables from Bank subsidiary 186 — — (186 ) — Nonbank subsidiaries 259 — 282 (541 ) — Investment in subsidiaries Bank subsidiary 16,496 16,496 — (32,992 ) — Nonbank subsidiaries 10,902 11 — (10,913 ) — Premiums receivable and other insurance assets — — 1,827 (26 ) 1,801 Other assets 4,785 — 4,488 (2,952 ) 6,321 Total assets $ 40,785 $ 16,507 $ 154,185 $ (52,896 ) $ 158,581 Liabilities Deposit liabilities Noninterest-bearing $ — $ — $ 89 $ — $ 89 Interest-bearing 229 — 66,160 — 66,389 Total deposit liabilities 229 — 66,249 — 66,478 Short-term borrowings 3,453 — 4,648 — 8,101 Long-term debt 21,048 — 45,186 — 66,234 Intercompany debt to Nonbank subsidiaries 1,409 — 3,877 (5,286 ) — Intercompany payables to Bank subsidiary 142 — — (142 ) — Nonbank subsidiaries 420 — 191 (611 ) — Interest payable 258 — 92 — 350 Unearned insurance premiums and service revenue — — 2,434 — 2,434 Accrued expenses and other liabilities 387 82 4,028 (2,952 ) 1,545 Total liabilities 27,346 82 126,705 (8,991 ) 145,142 Total equity 13,439 16,425 27,480 (43,905 ) 13,439 Total liabilities and equity $ 40,785 $ 16,507 $ 154,185 $ (52,896 ) $ 158,581 (a) Amounts presented are based upon the legal transfer of the underlying assets to VIEs in order to reflect legal ownership. Condensed Consolidating Statement of Cash Flows Six months ended June 30, 2016 ($ in millions) Parent Guarantors Nonguarantors Consolidating adjustments Ally consolidated Operating activities Net cash provided by operating activities $ 132 $ — $ 2,919 $ (629 ) $ 2,422 Investing activities Purchases of available-for-sale securities — — (8,657 ) — (8,657 ) Proceeds from sales of available-for-sale securities — — 6,584 — 6,584 Proceeds from maturities and repayments of available-for-sale securities — — 1,536 — 1,536 Purchases of held-to-maturity securities — — (571 ) — (571 ) Net increase in finance receivables and loans (834 ) — (4,819 ) — (5,653 ) Proceeds from sales of finance receivables and loans originated as held-for-investment — — 4,156 — 4,156 Net change in loans — intercompany 61 — (2 ) (59 ) — Purchases of operating lease assets — — (1,472 ) — (1,472 ) Disposals of operating lease assets 9 — 3,038 — 3,047 Acquisitions of subsidiaries, net of cash acquired (288 ) — — — (288 ) Capital contributions to subsidiaries (988 ) — — 988 — Returns of contributed capital 1,971 8 — (1,979 ) — Net change in restricted cash 1 — 481 — 482 Net change in nonmarketable equity investments — — (354 ) — (354 ) Other, net (82 ) — 13 — (69 ) Net cash (used in) provided by investing activities (150 ) 8 (67 ) (1,050 ) (1,259 ) Financing activities Net change in short-term borrowings — third party 123 — (2,235 ) — (2,112 ) Net (decrease) increase in deposits (29 ) — 6,337 — 6,308 Proceeds from issuance of long-term debt — third party 1,115 — 7,905 — 9,020 Repayments of long-term debt — third party (596 ) — (13,709 ) — (14,305 ) Net change in debt — intercompany (8 ) — (62 ) 70 — Redemption of preferred stock (696 ) — — — (696 ) Dividends paid — third party (30 ) — — — (30 ) Dividends paid and returns of contributed capital — intercompany — (8 ) (2,600 ) 2,608 — Capital contributions from parent — — 988 (988 ) — Net cash used in financing activities (121 ) (8 ) (3,376 ) 1,690 (1,815 ) Effect of exchange-rate changes on cash and cash equivalents — — 3 — 3 Net decrease in cash and cash equivalents (139 ) — (521 ) 11 (649 ) Cash and cash equivalents at beginning of year 1,635 — 5,595 (850 ) 6,380 Cash and cash equivalents at June 30, $ 1,496 $ — $ 5,074 $ (839 ) $ 5,731 Six months ended June 30, 2015 ($ in millions) Parent Guarantors Nonguarantors Consolidating adjustments Ally consolidated Operating activities Net cash (used in) provided by operating activities $ (64 ) $ 525 $ 2,817 $ (1,535 ) $ 1,743 Investing activities Purchases of investment securities — — (8,165 ) — (8,165 ) Proceeds from sales of available-for-sale securities — — 2,865 — 2,865 Proceeds from maturities and repayments of available-for -sale securities — — 2,192 — 2,192 Net decrease (increase) in finance receivables and loans 787 — (6,258 ) — (5,471 ) Proceeds from sales of finance receivables and loans originated as held-for-investment — — 1,582 — 1,582 Net change in loans — intercompany 2,598 — 1,259 (3,857 ) — Purchases of operating lease assets — — (2,348 ) — (2,348 ) Disposals of operating lease assets — — 2,709 — 2,709 Capital contributions to subsidiaries (169 ) (1 ) 1 169 — Returns of contributed capital 602 — — (602 ) — Proceeds from sale of business unit, net 1,049 — — — 1,049 Net change in restricted cash — — 449 — 449 Net change in nonmarketable equity investments — — 88 — 88 Other, net (10 ) — (132 ) — (142 ) Net cash provided by (used in) investing activities 4,857 (1 ) (5,758 ) (4,290 ) (5,192 ) Financing activities Net change in short-term borrowings — third party 121 — 2,824 — 2,945 Net (decrease) increase in deposits (72 ) — 3,785 — 3,713 Proceeds from issuance of long-term debt — third party 3,780 — 14,038 — 17,818 Repayments of long-term debt — third party (5,837 ) — (13,147 ) — (18,984 ) Net change in debt — intercompany (1,131 ) — (2,597 ) 3,728 — Repurchase and redemption of preferred stock (442 ) — — — (442 ) Dividends paid — third party (1,318 ) — — — (1,318 ) Dividends paid and returns of contributed capital — intercompany — (525 ) (1,612 ) 2,137 — Capital contributions from parent — 1 168 (169 ) — Net cash (used in) provided by financing activities (4,899 ) (524 ) 3,459 5,696 3,732 Effect of exchange-rate changes on cash and cash equivalents — — (1 ) — (1 ) Net (decrease) increase in cash and cash equivalents (106 ) — 517 (129 ) 282 Cash and cash equivalents at beginning of year 2,286 — 3,905 (615 ) 5,576 Cash and cash equivalents at June 30, $ 2,180 $ — $ 4,422 $ (744 ) $ 5,858

Contingencies And Other Risks

Contingencies And Other Risks	6 Months Ended
	Jun. 30, 2016
Loss Contingency [Abstract]
Contingencies Disclosure and Other Risks [Text Block]	Contingencies and Other Risks In the normal course of business, we enter into transactions that expose us to varying degrees of risk. Legal Proceedings We are or may be subject to potential liability under various governmental proceedings, claims, and legal actions that are pending or otherwise asserted against us. We are named as defendants in a number of legal actions, and we are involved in governmental proceedings arising in connection with our respective businesses. Some of the pending actions purport to be class actions, and certain legal actions include claims for substantial compensatory and/or punitive damages or claims for indeterminate amounts of damages. We establish reserves for legal claims when payments associated with the claims become probable and the payments can be reasonably estimated. Given the inherent difficulty of predicting the outcome of litigation and regulatory matters, it is generally very difficult to predict what the eventual outcome will be, and when the matter will be resolved. The actual costs of resolving legal claims may be higher or lower than any amounts reserved for the claims. On the basis of information currently available, advice of counsel, available insurance coverage, and established reserves, it is the opinion of management that the eventual outcome of the current actions against us will not have a material adverse effect on our consolidated financial condition, results of operations, or cash flows. However, it is possible that the ultimate resolution of legal matters, if unfavorable, may be material to our consolidated financial condition, results of operations, or cash flows in a particular period. Regulatory Matters Ally and its subsidiaries, including Ally Bank, are or may become involved from time to time in formal and informal reviews, investigations, examinations, proceedings, and information-gathering requests by federal and state government and self-regulatory agencies, including, among others, the U.S. Department of Justice (DOJ), the SEC, Consumer Financial Protection Bureau (CFPB), the FRB, the FDIC, the Utah Department of Financial Institutions, and the Federal Trade Commission regarding their respective operations. Mortgage Matters We have received subpoenas from the DOJ that include a broad request for documentation and other information relating to residential mortgage-backed securities issued by our former mortgage subsidiary, Residential Capital, LLC and its subsidiaries (ResCap RMBS). In connection with these requests, the DOJ is investigating potential fraud and other potential legal claims related to ResCap RMBS, including its investigation of potential claims under the Financial Institutions Reform, Recovery, and Enforcement Act of 1989. The DOJ is also investigating potential claims under the False Claims Act (FCA) related to representations made by us in connection with investments in Ally made by the United States Department of the Treasury pursuant to the Troubled Asset Relief Program in 2008 and 2009 regarding certain claims against Residential Capital, LLC or its subsidiaries at that time. We continue to engage in discussions with the DOJ with respect to legal and factual aspects of their investigations and potential claims. As previously disclosed, at the request of the DOJ, we entered into an agreement to voluntarily extend the statutes of limitations related to potential FCA claims. This agreement expired at the end of January 2016. We have separately received subpoenas and document requests from the SEC that include information covering a wide range of mortgage-related matters. These matters could result in material adverse consequences including, without limitation, adverse judgments, significant settlements, fines, penalties, injunctions, or other actions. Automotive Subprime Matters In October 2014, we received a document request from the SEC in connection with its investigation related to subprime automotive finance and related securitization activities. Separately, in December 2014, we received a subpoena from the DOJ requesting similar information. In May 2015, we received an information request from the New York Department of Financial Services requesting similar information. We have cooperated with each of these agencies with respect to these matters. These matters could result in material adverse consequences including, without limitation, adverse judgments, significant settlements, fines, penalties, injunctions, or other actions. CFPB In December 2013, Ally Financial Inc. and Ally Bank entered into Consent Orders issued by the CFPB and the DOJ pertaining to the allegation of disparate impact in the automotive finance business. The Consent Orders require Ally to create a compliance plan addressing, at a minimum, the communication of Ally’s expectations of Equal Credit Opportunity Act compliance to dealers, maintenance of Ally’s existing limits on dealer finance income for contracts acquired by Ally, and monitoring for potential discrimination both at the dealer level and within our portfolio of contracts acquired across all dealers. Ally formed a compliance committee consisting of certain Ally and Ally Bank directors to oversee Ally’s execution of the Consent Orders’ terms. Ally is required to meet certain stipulations under the Consent Orders, including a requirement to make monetary payments when ongoing remediation targets are not attained. These matters could result in material adverse consequences including, without limitation, adverse judgments, significant settlements, fines, penalties, injunctions, or other actions. Other Contingencies We are subject to potential liability under various other exposures including tax, nonrecourse loans, self-insurance, and other miscellaneous contingencies. We establish reserves for these contingencies when the loss becomes probable and the amount can be reasonably estimated. The actual costs of resolving these items may be substantially higher or lower than the amounts reserved for any one item. Based on information currently available, it is the opinion of management that the eventual outcome of these items will not have a material adverse impact on our results of operations, financial position, or cash flows.

Subsequent Events

Subsequent Events	6 Months Ended
	Jun. 30, 2016
Subsequent Events [Abstract]
Subsequent Events [Text Block]	Subsequent Events Declaration of Quarterly Dividend Payment and Authorization of Stock Repurchase Program On July 18, 2016 , the Ally Board of Directors declared a quarterly dividend payment of $0.08 per share on all common stock. The dividend is payable on August 15, 2016 , to shareholders of record at the close of business on August 1, 2016. Additionally, the Ally Board of Directors authorized a common stock repurchase program of up to $700 million beginning in the third quarter of 2016 and continuing through the second quarter of 2017.

Description Of Business, Basi34

Description Of Business, Basis of Presentation, And Changes in Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Business Combinations Policy [Policy Text Block]	Business Combinations We account for our business acquisitions using the acquisition method of accounting. Under this method we generally record the initial carrying values of purchased assets, including identifiable intangible assets, and assumed liabilities at fair value on the acquisition date. We recognize goodwill when the acquisition price is greater than the fair value of the net assets acquired, including identifiable intangible assets. The initial fair value of recognized assets and liabilities are subject to refinement during the measurement period, a period up to one year after the closing date of an acquisition, as information relative to closing date fair values becomes available. Costs directly related to business combinations are recorded as expenses as they are incurred.
Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block]	Goodwill and Other Intangibles Goodwill and intangible assets, net of accumulated amortization, are reported in other assets. Our intangible assets primarily consist of acquired customer relationships and developed technology, and are amortized using a straight line methodology over their estimated useful lives. We review intangible assets for impairment at least annually, or whenever events or changes in circumstances indicate that the carrying amount of the asset may not be recoverable. If it is determined the carrying amount of the asset is not recoverable, an impairment charge is recorded. Refer to Note 2 for further discussion on intangible assets. Goodwill represents the excess of the cost of an acquisition over the fair value of net assets acquired, including identifiable intangibles. We test goodwill for impairment annually, or more frequently if events and changes in circumstances indicate that it is more likely than not that impairment exists. Our annual goodwill impairment test is performed as of August 31 of each year. Goodwill is reviewed for impairment utilizing a two-step process. The first step of the impairment test requires us to define the reporting units and compare the fair value of each of the reporting units to their respective carrying value. The fair value of the reporting units in our impairment test is determined based on various analyses including discounted cash flow projections using assumptions a market participant would use. If the carrying value is less than the fair value, no impairment exists, and the second step does not need to be completed. If the carrying value is higher than the fair value or there is an indication that impairment may exist, a second step must be performed where we determine the implied value of goodwill based on the individual fair values of the reporting unit's assets and liabilities, including unrecognized intangibles, to compute the amount of the impairment. Refer to Note 2 for further discussion on goodwill.
Income Tax, Policy [Policy Text Block]	Income Taxes In calculating the provision for interim income taxes, in accordance with Accounting Standards Codification (ASC) 740, Income Taxes , we apply an estimated annual effective tax rate to year-to-date ordinary income. At the end of each interim period, we estimate the effective tax rate expected to be applicable for the full fiscal year. This method differs from that described in Note 1 to the Annual Consolidated Financial Statements, which describes our annual significant income tax accounting policy and related methodology.
Marketable Securities, Policy [Policy Text Block]	Investments Our portfolio of investments includes various debt and marketable equity securities and nonmarketable equity investments. Debt and marketable equity securities are classified based on management’s intent to sell or hold the security. We classify debt securities as held-to-maturity only when we have both the intent and ability to hold the securities to maturity. We classify debt and marketable equity securities as trading when the securities are acquired for the purpose of selling or holding them for a short period of time. Securities not classified as either held-to-maturity or trading are classified as available-for-sale. Our debt and marketable equity securities include government securities, corporate bonds, asset-backed securities (ABS), mortgage-backed securities (MBS), equity securities and other investments. Our portfolio includes securities classified as available-for-sale and held-to-maturity. Our available-for-sale securities are carried at fair value with unrealized gains and losses included in accumulated other comprehensive income or loss and are subject to impairment. Our held-to-maturity securities are carried at amortized cost and are subject to impairment. We amortize premiums and discounts on debt securities as an adjustment to investment yield generally over the stated maturity of the security. For ABS and MBS where prepayments can be reasonably estimated, amortization is adjusted for expected prepayments. Additionally, we assess our debt and marketable equity securities for potential other-than-temporary impairment. We employ a methodology that considers available evidence in evaluating potential other-than-temporary impairment of our debt and marketable equity securities classified as available-for-sale and held-to-maturity. If the cost of an investment exceeds its fair value, we evaluate, among other factors, the magnitude and duration of the decline in fair value. We also evaluate the financial health of and business outlook for the issuer, the performance of the underlying assets for interests in securitized assets, and, for securities classified as available-for-sale, our intent and ability to hold the investment through recovery of its amortized cost basis. Once a decline in fair value of a debt security is determined to be other-than-temporary, an impairment charge for the credit component is recorded to other gain (loss) on investments, net, in our Consolidated Statement of Income, and a new cost basis in the investment is established. Noncredit component losses of a debt security are recorded in other comprehensive income (loss) when we do not intend to sell the security and it is not more likely than not that we will have to sell the security prior to the security's anticipated recovery. Unrealized losses that we have determined to be other-than-temporary on equity securities are recorded to other gain (loss) on investments, net in our Consolidated Statement of Income. Subsequent increases and decreases to the fair value of available-for-sale debt and equity securities are included in other comprehensive income (loss), so long as they are not attributable to another other-than-temporary impairment. Realized gains and losses on investment securities are reported in other gain (loss) on investments, net, and are determined using the specific identification method. For information on our debt and marketable equity securities, refer to Note 6 . In addition to our investments in debt and marketable equity securities, we hold equity positions in other entities. These positions include Federal Home Loan Bank (FHLB) and Federal Reserve Bank (FRB) stock held to meet regulatory requirements, other equity investments that are not publicly traded and do not have a readily determinable fair value, equity investments in low income housing tax credits, and Community Reinvestment Act (CRA) equity investments. Our investments in FHLB and FRB stock and other equity investments are accounted for using the cost method of accounting. Our low income housing tax credit investments are accounted for using the proportionate amortization method of accounting for qualified affordable housing investments. Our CRA investments are accounted for using the equity method of accounting. Our FHLB and FRB stock and other equity investments carried at cost are included in nonmarketable equity investments in other assets. Our investments in low income housing tax credits and CRA are also included in other assets. As conditions warrant, we review our investments carried at cost for impairment and will adjust the carrying value of the investment if it is deemed to be impaired. No impairment was recognized in 2016 or 2015. For more information on our nonmarketable equity investments, refer to Note 22 .

Discontinued and Held-for-sal35

Discontinued and Held-for-sale Operations Discontinued and Held-for-sale Operations (Policies)	6 Months Ended
	Jun. 30, 2016
Accounting Policies [Abstract]
Discontinued Operations, Policy [Policy Text Block]	Prior to the adoption of ASU 2014-08, which was prospectively applied only to newly identified disposals that qualify as discontinued operations beginning after January 1, 2015, we have classified operations as discontinued when operations and cash flows will be eliminated from our ongoing operations and we do not expect to retain any significant continuing involvement in their operations after the respective sale or disposal transactions. For all periods presented, the operating results for these discontinued operations have been removed from continuing operations and presented separately as discontinued operations, net of tax, in the Condensed Consolidated Statement of Comprehensive Income . The Notes to the Condensed Consolidated Financial Statements have been adjusted to exclude discontinued operations unless otherwise noted.

Acquisition of Trade King Acq36

Acquisition of Trade King Acquisition of Trade King (Tables)	6 Months Ended
	Jun. 30, 2016
Business Combinations [Abstract]
Schedule of Business Acquisitions, by Acquisition [Table Text Block]	The following table summarizes the allocation of cash consideration paid for TradeKing and the amounts of the identifiable assets acquired and liabilities assumed recognized at the acquisition date. ($ in millions) Purchase price Cash consideration $ 298 Allocation of purchase price to net assets acquired Intangible assets 82 Cash and short-term investments (a) 50 Other assets 14 Deferred tax asset, net 4 Employee compensation and benefits (41 ) Other liabilities (4 ) Goodwill $ 193 (a) Includes $40 million in cash proceeds from the acquisition transaction in order to pay employee compensation and benefits that vested upon acquisition as a result of the change in control.

Discontinued and Held-for-sal37

Discontinued and Held-for-sale Operations (Tables)	6 Months Ended
	Jun. 30, 2016
Discontinued Operations and Disposal Groups [Abstract]
Schedule of Disposal Groups, Including Discontinued Operations, Income Statement, Balance Sheet and Additional Disclosures [Table Text Block]	Select financial information of discontinued operations is summarized below. The pretax income or loss includes direct costs to transact a sale. Three months ended June 30, Six months ended June 30, ($ in millions) 2016 2015 2016 2015 Select Automotive Finance operations Pretax (loss) income (a) $ (1 ) $ (5 ) $ — $ 453 Tax expense (b) — — — 65 Other operations Pretax (loss) income $ (1 ) $ 18 $ 2 $ 20 Tax benefit (5 ) — (4 ) (2 ) (a) Includes certain treasury and other corporate activity recognized by Corporate and Other. (b) Includes certain income tax activity recognized by Corporate and Other.

Other Income, Net Of Losses (Ta

Other Income, Net Of Losses (Tables)	6 Months Ended
	Jun. 30, 2016
Other Nonoperating Income (Expense) [Abstract]
Schedule of Other Nonoperating Income, by Component [Table Text Block]	Details of other income, net of losses, were as follows. Three months ended June 30, Six months ended June 30, ($ in millions) 2016 2015 2016 2015 Remarketing fees $ 25 $ 25 $ 53 $ 53 Late charges and other administrative fees 22 21 47 43 Servicing fees 18 10 31 20 Income from equity-method investments 5 4 11 37 Other, net 26 24 49 38 Total other income, net of losses $ 96 $ 84 $ 191 $ 191

Other Operating Expenses (Table

Other Operating Expenses (Tables)	6 Months Ended
	Jun. 30, 2016
Operating Expenses [Abstract]
Schedule of Other Operating Cost and Expense, by Component [Table Text Block]	Details of other operating expenses were as follows. Three months ended June 30, Six months ended June 30, ($ in millions) 2016 2015 2016 2015 Insurance commissions $ 97 $ 95 $ 191 $ 188 Technology and communications 67 64 133 133 Lease and loan administration 34 32 66 61 Professional services 26 25 50 45 Advertising and marketing 21 23 48 54 Vehicle remarketing and repossession 22 18 46 37 Premises and equipment depreciation 21 22 42 42 Regulatory and licensing fees 21 20 42 41 Occupancy 12 13 25 24 Non-income taxes 8 7 17 15 Other 57 47 111 110 Total other operating expenses $ 386 $ 366 $ 771 $ 750

Investment Securities (Tables)

Investment Securities (Tables)	6 Months Ended
	Jun. 30, 2016
Investments, Debt and Equity Securities [Abstract]
Investment [Table Text Block]	Our portfolio of securities includes bonds, equity securities, asset- and mortgage-backed securities, and other investments. The cost, fair value, and gross unrealized gains and losses on investment securities were as follows. June 30, 2016 December 31, 2015 Amortized cost Gross unrealized Fair value Amortized cost Gross unrealized Fair value ($ in millions) gains losses gains losses Available-for-sale securities Debt securities U.S. Treasury and federal agencies $ 265 $ 10 $ — $ 275 $ 1,760 $ — $ (19 ) $ 1,741 U.S. States and political subdivisions 701 33 (1 ) 733 693 24 (1 ) 716 Foreign government 180 11 — 191 169 8 — 177 Mortgage-backed residential (a) 12,446 199 (28 ) 12,617 10,459 52 (145 ) 10,366 Mortgage-backed commercial 513 1 (8 ) 506 486 — (5 ) 481 Asset-backed 1,671 6 (3 ) 1,674 1,762 1 (8 ) 1,755 Corporate debt 1,566 39 (3 ) 1,602 1,213 8 (17 ) 1,204 Total debt securities (b) (c) 17,342 299 (43 ) 17,598 16,542 93 (195 ) 16,440 Equity securities 675 6 (82 ) 599 808 3 (94 ) 717 Total available-for-sale securities $ 18,017 $ 305 $ (125 ) $ 18,197 $ 17,350 $ 96 $ (289 ) $ 17,157 Total held-to-maturity securities (d) $ 571 $ 9 $ (1 ) $ 579 $ — $ — $ — $ — (a) Residential mortgage-backed securities include agency-backed bonds totaling $9,997 million and $7,544 million at June 30, 2016 , and December 31, 2015 , respectively. (b) Certain entities related to our Insurance operations are required to deposit securities with state regulatory authorities. These deposited securities totaled $15 million and $14 million at June 30, 2016 , and December 31, 2015 . (c) Investment securities with a fair value of $492 million and $2,506 million at June 30, 2016 , and December 31, 2015 , were pledged to secure advances from the FHLB, short-term borrowings or repurchase agreements and for other purposes as required by contractual obligation or law. Under these agreements, Ally has granted the counterparty the right to sell or pledge $492 million and $745 million of the underlying investment securities at June 30, 2016 , and December 31, 2015 , respectively. (d) Held-to-maturity securities are recorded at amortized cost and consist of agency-backed residential mortgage-backed debt securities for liquidity purposes
Investments Classified by Contractual Maturity Date [Table Text Block]	The maturity distribution of investment securities outstanding is summarized in the following tables. Call or prepayment options may cause actual maturities to differ from contractual maturities. Total Due in one year or less Due after one year through five years Due after five years through ten years Due after ten years ($ in millions) Amount Yield Amount Yield Amount Yield Amount Yield Amount Yield June 30, 2016 Fair value of available-for-sale debt securities (a) U.S. Treasury and federal agencies $ 275 1.8 % $ 2 4.2 % $ 61 1.5 % $ 212 1.9 % $ — — % U.S. States and political subdivisions 733 3.1 127 2.4 31 1.9 123 3.0 452 3.4 Foreign government 191 2.7 9 2.5 85 2.9 97 2.5 — — Mortgage-backed residential 12,617 2.9 — — 1 4.5 28 2.5 12,588 2.9 Mortgage-backed commercial 506 2.3 — — — — 3 2.8 503 2.3 Asset-backed 1,674 2.7 — — 992 2.5 444 3.2 238 2.4 Corporate debt 1,602 2.9 73 2.7 919 2.6 575 3.3 35 5.1 Total available-for-sale debt securities $ 17,598 2.9 $ 211 2.5 $ 2,089 2.5 $ 1,482 3.0 $ 13,816 2.9 Amortized cost of available-for-sale debt securities $ 17,342 $ 211 $ 2,066 $ 1,439 $ 13,626 Amortized cost of held-to-maturity securities $ 571 2.9 % $ — — % $ — — % $ — — % $ 571 2.9 % December 31, 2015 Fair value of available-for-sale debt securities (a) U.S. Treasury and federal agencies $ 1,741 1.8 % $ 6 5.1 % $ 510 1.2 % $ 1,225 2.1 % $ — — % U.S. States and political subdivisions 716 3.2 86 1.3 37 2.2 141 2.8 452 3.7 Foreign government 177 2.6 9 1.9 77 2.8 91 2.6 — — Mortgage-backed residential 10,366 2.9 — — 33 2.1 36 2.5 10,297 2.9 Mortgage-backed commercial 481 2.0 — — — — 3 2.7 478 2.0 Asset-backed 1,755 2.3 6 1.4 1,027 2.1 518 2.6 204 2.2 Corporate debt 1,204 2.9 50 3.0 713 2.5 410 3.4 31 5.4 Total available-for-sale debt securities $ 16,440 2.7 $ 157 2.0 $ 2,397 2.1 $ 2,424 2.5 $ 11,462 2.9 Amortized cost of available-for-sale debt securities $ 16,542 $ 156 $ 2,404 $ 2,436 $ 11,546 (a) Yield is calculated using the effective yield of each security at the end of the period, weighted based on the market value. The effective yield considers the contractual coupon and amortized cost, and excludes expected capital gains and losses.
Investment Income [Table Text Block]	The following table presents interest and dividends on investment securities. Three months ended June 30, Six months ended June 30, ($ in millions) 2016 2015 2016 2015 Taxable interest $ 89 $ 82 $ 183 $ 162 Taxable dividends 5 6 9 11 Interest and dividends exempt from U.S. federal income tax 5 5 9 8 Interest and dividends on investment securities $ 99 $ 93 $ 201 $ 181
Schedule of Realized Gain (Loss) [Table Text Block]	The following table presents gross gains and losses realized upon the sales of available-for-sale securities and other-than-temporary impairment. Three months ended June 30, Six months ended June 30, ($ in millions) 2016 2015 2016 2015 Gross realized gains $ 40 $ 46 $ 94 $ 106 Gross realized losses (a) (1 ) — (1 ) (3 ) Other-than-temporary impairment — (1 ) — (3 ) Other gain on investments, net $ 39 $ 45 $ 93 $ 100 (a) Certain available-for-sale securities were sold at a loss in 2016 and 2015 as a result of market conditions within these respective periods (e.g., a downgrade in the rating of a debt security). Any such sales were made in accordance with our risk management policies and practices.
Schedule of Unrealized Loss on Investments [Table Text Block]	The table below summarizes available-for-sale securities in an unrealized loss position in accumulated other comprehensive income. Based on the assessment of whether such losses were deemed to be other than temporary, we believe that the unrealized losses are not indicative of an other-than-temporary impairment of these securities. As of June 30, 2016 , we did not have the intent to sell the debt securities with an unrealized loss position in accumulated other comprehensive income, it is not more likely than not that we will be required to sell these securities before recovery of their amortized cost basis, and we expect to recover the entire amortized cost basis of the securities. As of June 30, 2016 , we had the ability and intent to hold equity securities with an unrealized loss position in accumulated other comprehensive income, and it is not more likely than not that we will be required to sell these securities before recovery of their amortized cost basis. As a result, we believe that the securities with an unrealized loss position in accumulated other comprehensive income are not considered to be other-than-temporarily impaired at June 30, 2016 . Refer to Note 1 for additional information related to investment securities and our methodology for evaluating potential other-than-temporary impairments. June 30, 2016 December 31, 2015 Less than 12 months 12 months or longer Less than 12 months 12 months or longer ($ in millions) Fair value Unrealized loss Fair value Unrealized loss Fair value Unrealized loss Fair value Unrealized loss Available-for-sale securities Debt securities U.S. Treasury and federal agencies $ — $ — $ — $ — $ 1,553 $ (17 ) $ 173 $ (2 ) U.S. States and political subdivisions 169 (1 ) 10 — 179 (1 ) — — Foreign government — — — — 2 — — — Mortgage-backed 676 (6 ) 2,139 (30 ) 4,096 (43 ) 2,453 (107 ) Asset-backed 656 (2 ) 144 (1 ) 1,402 (8 ) 64 — Corporate debt 73 (1 ) 63 (2 ) 745 (16 ) 12 (1 ) Total temporarily impaired debt securities 1,574 (10 ) 2,356 (33 ) 7,977 (85 ) 2,702 (110 ) Temporarily impaired equity securities 268 (37 ) 207 (45 ) 534 (54 ) 96 (40 ) Total temporarily impaired available-for-sale securities $ 1,842 $ (47 ) $ 2,563 $ (78 ) $ 8,511 $ (139 ) $ 2,798 $ (150 )

Finance Receivables And Loans41

Finance Receivables And Loans, Net (Tables)	6 Months Ended
	Jun. 30, 2016
Loans and Leases Receivable, Net Reported Amount, by Category Alternative [Abstract]
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]	The composition of finance receivables and loans reported at gross carrying value was as follows. ( $ in millions ) June 30, 2016 December 31, 2015 Consumer automotive (a) $ 63,281 $ 64,292 Consumer mortgage Mortgage Finance (b) 8,009 6,413 Mortgage — Legacy (c) 3,075 3,360 Total consumer mortgage 11,084 9,773 Total consumer 74,365 74,065 Commercial Commercial and industrial Automotive 31,640 31,469 Other 3,037 2,640 Commercial real estate — Automotive 3,611 3,426 Total commercial 38,288 37,535 Total finance receivables and loans (d) $ 112,653 $ 111,600 (a) Includes $88 million and $66 million of fair value adjustment for loans in hedge accounting relationships at June 30, 2016 , and December 31, 2015 , respectively. Refer to Note 20 for additional information. (b) Includes loans originated as interest-only mortgage loans of $38 million and $44 million at June 30, 2016 , and December 31, 2015 , respectively, 5% of which are expected to start principal amortization in 2016 , 2% in 2017 , none in 2018 , 38% in 2019 , and 38% thereafter. (c) Includes loans originated as interest-only mortgage loans of $830 million and $941 million at June 30, 2016 , and December 31, 2015 , respectively, 22% of which are expected to start principal amortization in 2016 , 22% in 2017 , 2% in 2018 , none in 2019 , and 1% thereafter. (d) Totals include a net increase of $268 million and $110 million at June 30, 2016 , and December 31, 2015 , respectively, for unearned income, unamortized premiums and discounts, and deferred fees and costs.
Allowance for Credit Losses on Financing Receivables [Table Text Block]	The following tables present an analysis of the activity in the allowance for loan losses on finance receivables and loans. Three months ended June 30, 2016 ($ in millions) Consumer automotive Consumer mortgage Commercial Total Allowance at April 1, 2016 $ 850 $ 115 $ 112 $ 1,077 Charge-offs (227 ) (9 ) (1 ) (237 ) Recoveries 79 5 1 85 Net charge-offs (148 ) (4 ) — (152 ) Provision for loan losses 168 (2 ) 6 172 Other (a) (8 ) — — (8 ) Allowance at June 30, 2016 $ 862 $ 109 $ 118 $ 1,089 (a) Primarily related to the transfer of finance receivables and loans from held-for-investment to held-for-sale. Three months ended June 30, 2015 ( $ in millions ) Consumer automotive Consumer mortgage Commercial Total Allowance at April 1, 2015 $ 711 $ 119 $ 103 $ 933 Charge-offs (166 ) (9 ) — (175 ) Recoveries 70 5 — 75 Net charge-offs (96 ) (4 ) — (100 ) Provision for loan losses 152 3 (15 ) 140 Other — 1 — 1 Allowance at June 30, 2015 $ 767 $ 119 $ 88 $ 974 Six months ended June 30, 2016 ($ in millions) Consumer automotive Consumer mortgage Commercial Total Allowance at January 1, 2016 $ 834 $ 114 $ 106 $ 1,054 Charge-offs (480 ) (19 ) (1 ) (500 ) Recoveries 159 9 1 169 Net charge-offs (321 ) (10 ) — (331 ) Provision for loan losses 375 5 12 392 Other (a) (26 ) — — (26 ) Allowance at June 30, 2016 $ 862 $ 109 $ 118 $ 1,089 Allowance for loan losses at June 30, 2016 Individually evaluated for impairment $ 26 $ 37 $ 23 $ 86 Collectively evaluated for impairment 836 72 95 1,003 Loans acquired with deteriorated credit quality — — — — Finance receivables and loans at gross carrying value Ending balance $ 63,281 $ 11,084 $ 38,288 $ 112,653 Individually evaluated for impairment 348 254 122 724 Collectively evaluated for impairment 62,933 10,830 38,166 111,929 Loans acquired with deteriorated credit quality — — — — (a) Primarily related to the transfer of finance receivables and loans from held-for-investment to held-for-sale. Six months ended June 30, 2015 ($ in millions) Consumer automotive Consumer mortgage Commercial Total Allowance at January 1, 2015 $ 685 $ 152 $ 140 $ 977 Charge-offs (359 ) (31 ) — (390 ) Recoveries 131 8 1 140 Net charge-offs (228 ) (23 ) 1 (250 ) Provision for loan losses 310 (2 ) (52 ) 256 Other (a) — (8 ) (1 ) (9 ) Allowance at June 30, 2015 $ 767 $ 119 $ 88 $ 974 Allowance for loan losses at June 30, 2015 Individually evaluated for impairment $ 22 $ 50 $ 19 $ 91 Collectively evaluated for impairment 745 69 69 883 Loans acquired with deteriorated credit quality — — — — Finance receivables and loans at gross carrying value Ending balance $ 60,786 $ 9,211 $ 35,175 $ 105,172 Individually evaluated for impairment 275 265 99 639 Collectively evaluated for impairment 60,511 8,946 35,076 104,533 Loans acquired with deteriorated credit quality — — — — (a) Primarily related to the transfer of finance receivables and loans from held-for-investment to held-for-sale.
Schedule Of Sales Of Financing Receivables And Loans [Table Text Block]	The following table presents the gross carrying value of significant sales of finance receivables and loans and transfers of finance receivables and loans from held-for-investment to held-for-sale. Three months ended June 30, Six months ended June 30, ( $ in millions ) 2016 2015 2016 2015 Consumer automotive $ 1,560 $ — $ 4,159 $ — Consumer mortgage 4 4 6 73 Commercial 28 — 28 — Total sales and transfers $ 1,592 $ 4 $ 4,193 $ 73
Schedule of Purchases of Financing Receivables and Loans [Table Text Block]	The following table presents information about significant purchases of finance receivables and loans. Three months ended June 30, Six months ended June 30, ($ in millions) 2016 2015 2016 2015 Consumer automotive $ — $ — $ — $ — Consumer mortgage 1,018 1,996 2,388 2,650 Total purchases of finance receivables and loans $ 1,018 $ 1,996 $ 2,388 $ 2,650
Past Due Financing Receivables [Table Text Block]	The following table presents an analysis of our past due finance receivables and loans recorded at gross carrying value. ( $ in millions ) 30-59 days past due 60-89 days past due 90 days or more past due Total past due Current Total finance receivables and loans June 30, 2016 Consumer automotive $ 1,438 $ 307 $ 226 $ 1,971 $ 61,310 $ 63,281 Consumer mortgage Mortgage Finance 49 5 8 62 7,947 8,009 Mortgage — Legacy 47 12 62 121 2,954 3,075 Total consumer mortgage 96 17 70 183 10,901 11,084 Total consumer 1,534 324 296 2,154 72,211 74,365 Commercial Commercial and industrial Automotive — — — — 31,640 31,640 Other — — — — 3,037 3,037 Commercial real estate — Automotive — — — — 3,611 3,611 Total commercial — — — — 38,288 38,288 Total consumer and commercial $ 1,534 $ 324 $ 296 $ 2,154 $ 110,499 $ 112,653 December 31, 2015 Consumer automotive $ 1,618 $ 369 $ 222 $ 2,209 $ 62,083 $ 64,292 Consumer mortgage Mortgage Finance 44 5 10 59 6,354 6,413 Mortgage — Legacy 53 20 73 146 3,214 3,360 Total consumer mortgage 97 25 83 205 9,568 9,773 Total consumer 1,715 394 305 2,414 71,651 74,065 Commercial Commercial and industrial Automotive — — — — 31,469 31,469 Other — — — — 2,640 2,640 Commercial real estate — Automotive — — — — 3,426 3,426 Total commercial — — — — 37,535 37,535 Total consumer and commercial $ 1,715 $ 394 $ 305 $ 2,414 $ 109,186 $ 111,600
Schedule of Financing Receivables, Non Accrual Status [Table Text Block]	The following table presents the gross carrying value of our finance receivables and loans on nonaccrual status. ( $ in millions ) June 30, 2016 December 31, 2015 Consumer automotive $ 505 $ 475 Consumer mortgage Mortgage Finance 12 15 Mortgage — Legacy 95 113 Total consumer mortgage 107 128 Total consumer 612 603 Commercial Commercial and industrial Automotive 51 25 Other 64 44 Commercial real estate — Automotive 7 8 Total commercial 122 77 Total consumer and commercial finance receivables and loans $ 734 $ 680
Financing Receivable Credit Quality Indicators - Performing and Nonperforming [Table Text Block]	The following table presents performing and nonperforming credit quality indicators in accordance with our internal accounting policies for our consumer finance receivables and loans recorded at gross carrying value. Nonperforming loans include finance receivables and loans on nonaccrual status when the principal or interest has been delinquent for 90 days or when full collection is not expected. Refer to Note 1 to the Annual Consolidated Financial Statements for additional information. June 30, 2016 December 31, 2015 ( $ in millions ) Performing Nonperforming Total Performing Nonperforming Total Consumer automotive $ 62,776 $ 505 $ 63,281 $ 63,817 $ 475 $ 64,292 Consumer mortgage Mortgage Finance 7,997 12 8,009 6,398 15 6,413 Mortgage — Legacy 2,980 95 3,075 3,247 113 3,360 Total consumer mortgage 10,977 107 11,084 9,645 128 9,773 Total consumer $ 73,753 $ 612 $ 74,365 $ 73,462 $ 603 $ 74,065
Schedule Of Pass And Criticized Credit Quality Indicators Of Finance Receivables [Table Text Block]	The following table presents pass and criticized credit quality indicators based on regulatory definitions for our commercial finance receivables and loans recorded at gross carrying value. June 30, 2016 December 31, 2015 ( $ in millions ) Pass Criticized (a) Total Pass Criticized (a) Total Commercial and industrial Automotive $ 29,638 $ 2,002 $ 31,640 $ 29,613 $ 1,856 $ 31,469 Other 2,354 683 3,037 2,122 518 2,640 Commercial real estate — Automotive 3,445 166 3,611 3,265 161 3,426 Total commercial $ 35,437 $ 2,851 $ 38,288 $ 35,000 $ 2,535 $ 37,535 (a) Includes loans classified as special mention, substandard, or doubtful. These classifications are based on regulatory definitions and generally represent loans within our portfolio that have a higher default risk or have already defaulted.
Impaired Financing Receivables [Table Text Block]	The following table presents information about our impaired finance receivables and loans. ( $ in millions ) Unpaid principal balance (a) Gross carrying value Impaired with no allowance Impaired with an allowance Allowance for impaired loans June 30, 2016 Consumer automotive $ 378 $ 348 $ 121 $ 227 $ 26 Consumer mortgage Mortgage Finance 8 8 3 5 — Mortgage — Legacy 250 246 56 190 37 Total consumer mortgage 258 254 59 195 37 Total consumer 636 602 180 422 63 Commercial Commercial and industrial Automotive 51 51 9 42 3 Other 77 64 — 64 17 Commercial real estate — Automotive 7 7 1 6 3 Total commercial 135 122 10 112 23 Total consumer and commercial finance receivables and loans $ 771 $ 724 $ 190 $ 534 $ 86 December 31, 2015 Consumer automotive $ 315 $ 315 $ — $ 315 $ 22 Consumer mortgage Mortgage Finance 9 9 5 4 1 Mortgage — Legacy 260 257 59 198 43 Total consumer mortgage 269 266 64 202 44 Total consumer 584 581 64 517 66 Commercial Commercial and industrial Automotive 25 25 4 21 3 Other 44 44 — 44 15 Commercial real estate — Automotive 8 8 1 7 2 Total commercial 77 77 5 72 20 Total consumer and commercial finance receivables and loans $ 661 $ 658 $ 69 $ 589 $ 86 (a) Adjusted for charge-offs.
Schedule of Average Balance And Interest Income Of Impaired Finance Receivables [Table Text Block]	The following tables present average balance and interest income for our impaired finance receivables and loans. 2016 2015 Three months ended June 30, ( $ in millions ) Average balance Interest income Average balance Interest income Consumer automotive $ 341 $ 4 $ 285 $ 5 Consumer mortgage Mortgage Finance 8 — 7 — Mortgage — Legacy 251 3 252 2 Total consumer mortgage 259 3 259 2 Total consumer 600 7 544 7 Commercial Commercial and industrial Automotive 35 — 41 1 Other 65 — 31 — Commercial real estate — Automotive 6 — 5 — Total commercial 106 — 77 1 Total consumer and commercial finance receivables and loans $ 706 $ 7 $ 621 $ 8 2016 2015 Six months ended June 30, ($ in millions) Average Interest Average Interest Consumer automotive $ 335 $ 8 $ 287 $ 9 Consumer mortgage Mortgage Finance 8 — 7 — Mortgage — Legacy 253 5 282 4 Total consumer mortgage 261 5 289 4 Total consumer 596 13 576 13 Commercial Commercial and industrial Automotive 32 — 38 1 Other 56 1 37 3 Commercial real estate — Automotive 7 — 5 — Total commercial 95 1 80 4 Total consumer and commercial finance receivables and loans $ 691 $ 14 $ 656 $ 17
Troubled Debt Restructurings on Financing Receivables [Table Text Block]	The following tables present information related to finance receivables and loans recorded at gross carrying value modified in connection with a TDR during the period. 2016 2015 Three months ended June 30, ($ in millions) Number of Pre-modification gross Post-modification Number of Pre-modification gross Post-modification Consumer automotive 4,767 $ 79 $ 68 4,096 $ 64 $ 54 Consumer mortgage Mortgage Finance 2 1 1 — — — Mortgage — Legacy 26 4 4 76 22 21 Total consumer mortgage 28 5 5 76 22 21 Total consumer 4,795 84 73 4,172 86 75 Commercial Commercial and industrial Automotive — — — — — — Other — — — — — — Commercial real estate — Automotive — — — — — — Total commercial — — — — — — Total consumer and commercial finance receivables and loans 4,795 $ 84 $ 73 4,172 $ 86 $ 75 2016 2015 Six months ended June 30, ($ in millions) Number of Pre-modification gross Post-modification Number of Pre-modification gross Post-modification Consumer automotive 10,389 $ 168 $ 144 8,151 $ 127 $ 107 Consumer mortgage Mortgage Finance 3 2 2 2 1 1 Mortgage — Legacy 57 8 8 114 28 26 Total consumer mortgage 60 10 10 116 29 27 Total consumer 10,449 178 154 8,267 156 134 Commercial Commercial and industrial Automotive — — — — — — Other — — — — — — Commercial real estate — Automotive — — — — — — Total commercial — — — — — — Total consumer and commercial finance receivables and loans 10,449 $ 178 $ 154 8,267 $ 156 $ 134
Finance receivables and loans redefaulted during the period [Table Text Block]	The following tables present information about finance receivables and loans recorded at gross carrying value that have redefaulted during the reporting period and were within 12 months or less of being modified as a TDR. Redefault is when finance receivables and loans meet the requirements for evaluation under our charge-off policy (refer to Note 1 to the Annual Consolidated Financial Statements for additional information) except for commercial finance receivables and loans, where redefault is defined as 90 days past due. 2016 2015 Three months ended June 30, ($ in millions) Number of loans Gross carrying value Charge-off amount Number of loans Gross carrying value Charge-off amount Consumer automotive 1,858 $ 23 $ 13 1,499 $ 18 $ 10 Consumer mortgage Mortgage Finance — — — — — — Mortgage — Legacy 2 — — 3 — — Total consumer finance receivables and loans 1,860 $ 23 $ 13 1,502 $ 18 $ 10 2016 2015 Six months ended June 30, ($ in millions) Number of loans Gross carrying value Charge-off amount Number of loans Gross carrying value Charge-off amount Consumer automotive 3,658 $ 46 $ 25 3,080 $ 37 $ 21 Consumer mortgage Mortgage Finance — — — — — — Mortgage — Legacy 3 — — 7 — — Total consumer finance receivables and loans 3,661 $ 46 $ 25 3,087 $ 37 $ 21

Investment In Operating Lease42

Investment In Operating Leases, Net (Tables)	6 Months Ended
	Jun. 30, 2016
Leases, Operating [Abstract]
Schedule of Property Subject to or Available for Operating Lease [Table Text Block]	Investments in operating leases were as follows. ($ in millions) June 30, 2016 December 31, 2015 Vehicles $ 17,418 $ 20,211 Accumulated depreciation (3,663 ) (3,940 ) Investment in operating leases, net $ 13,755 $ 16,271
Depreciation Expense On Operating Lease Assets [Table Text Block]	Depreciation expense on operating lease assets includes remarketing gains and losses recognized on the sale of operating lease assets. The following summarizes the components of depreciation expense on operating lease assets. Three months ended June 30, Six months ended June 30, ($ in millions) 2016 2015 2016 2015 Depreciation expense on operating lease assets (excluding remarketing gains) $ 520 $ 671 $ 1,085 $ 1,363 Remarketing gains (86 ) (108 ) (141 ) (178 ) Net depreciation expense on operating lease assets $ 434 $ 563 $ 944 $ 1,185

Securitizations And Variable 43

Securitizations And Variable Interest Entities (Tables)	6 Months Ended
	Jun. 30, 2016
Securitizations And Variable Interest Entities [Abstract]
Schedule of Variable Interest Entities [Table Text Block]	Our involvement with consolidated and nonconsolidated VIEs in which we hold variable interests is presented below. ($ in millions) Involvement Assets of Maximum exposure to June 30, 2016 On-balance sheet variable interest entities Consumer automotive $ 24,557 (b) Commercial automotive 15,791 Off-balance sheet variable interest entities Consumer automotive 24 $ 3,727 (c) $ 3,751 (d) Commercial other 246 (e) — (c) 537 (f) Total $ 40,618 $ 3,727 $ 4,288 December 31, 2015 On-balance sheet variable interest entities Consumer automotive $ 27,967 (b) Commercial automotive 16,763 Off-balance sheet variable interest entities Consumer automotive — $ 3,034 $ 3,034 (d) Commercial other 210 (e) — (c) 493 (f) Total $ 44,940 $ 3,034 $ 3,527 (a) Asset values represent the current unpaid principal balance of outstanding consumer finance receivables and loans within the VIEs. (b) Includes $10.0 billion and $10.6 billion of assets that are not encumbered by VIE beneficial interests held by third parties at June 30, 2016 , and December 31, 2015 , respectively. Ally or consolidated affiliates hold the interests in these assets which eliminate in consolidation. (c) Includes VIEs for which we have no management oversight and therefore we are not able to provide the total assets of the VIEs. (d) Maximum exposure to loss represents the current unpaid principal balance of outstanding loans based on our customary representation and warranty provisions and certain noncertificated interests retained from the sale of automotive finance receivables. This measure is based on the unlikely event that all of the loans have underwriting defects or other defects that trigger a representation and warranty provision and the collateral supporting the loans are worthless. This required disclosure is not an indication of our expected loss. (e) Includes $254 million and $222 million classified as other assets, offset by $8 million and $12 million classified as accrued expenses and other liabilities at June 30, 2016 , and December 31, 2015 , respectively. (f) For certain nonconsolidated affordable housing entities, maximum exposure to loss represents the yield we guaranteed investors through long term guarantee contracts. The amount disclosed is based on the unlikely event that the underlying properties cease generating yield to investors and the yield delivered to investors in the form of low income tax housing credits is recaptured. For nonconsolidated equity investments, maximum exposure to loss represents our outstanding investment, additional committed capital, and low income housing tax credits subject to recapture. The amount disclosed is based on the unlikely event that our committed capital is funded, our investments become worthless, and the tax credits previously delivered to us are recaptured. This required disclosure is not an indication of our expected loss.
Schedule Of Cash Flow Received And Paid To Nonconsolidated Securitization Entities [Table Text Block]	The following table summarizes cash flows received and paid related to securitization entities and asset-backed financings where the transfer is accounted for as a sale and we have a continuing involvement with the transferred assets (e.g., servicing) that were outstanding during the six months ended June 30, 2016 , and 2015 . Additionally, this table contains information regarding cash flows received from and paid to nonconsolidated securitization entities that existed during each period. Six months ended June 30, ( $ in millions ) Consumer automotive 2016 Cash proceeds from transfers completed during the period $ 1,604 Servicing fees 17 Other cash flows 5 2015 Servicing fees $ 13
Schedule of Quantitative Information and Net Credit Losses about Securitized and Other Financial Assets Managed Together [Table Text Block]	The following tables represent on-balance sheet loans held-for-sale and finance receivable and loans, off-balance sheet securitizations, and whole-loan sales where we have continuing involvement. The tables present quantitative information about delinquencies and net credit losses. Total Amount Amount 60 days or more ($ in millions) June 30, 2016 December 31, 2015 June 30, 2016 December 31, 2015 On-balance sheet loans Consumer automotive $ 63,281 $ 64,292 $ 533 $ 591 Consumer mortgage 11,084 9,773 87 108 Commercial automotive 35,251 34,895 — — Commercial other 3,052 2,745 — — Total on-balance sheet loans 112,668 111,705 620 699 Off-balance sheet securitization entities Consumer automotive 3,220 2,529 11 9 Total off-balance sheet securitization entities 3,220 2,529 11 9 Whole-loan sales (a) 4,024 2,252 6 13 Total $ 119,912 $ 116,486 $ 637 $ 721 (a) Whole-loan sales are not part of a securitization transaction, but represent consumer automotive pools of loans sold to third-party investors. Net credit losses Three months ended June 30, Six months ended June 30, ($ in millions) 2016 2015 2016 2015 On-balance sheet loans Consumer automotive $ 148 $ 96 $ 321 $ 228 Consumer mortgage 4 4 10 23 Commercial automotive — 1 — — Commercial other — (1 ) — (1 ) Total on-balance sheet loans 152 100 331 250 Off-balance sheet securitization entities Consumer automotive 2 1 4 2 Total off-balance sheet securitization entities 2 1 4 2 Whole-loan sales 1 — 1 — Total $ 155 $ 101 $ 336 $ 252

Servicing Activities (Tables)

Servicing Activities (Tables)	6 Months Ended
	Jun. 30, 2016
Servicing Activities [Abstract]
Schedule Of Total Serviced Automobile Loans Outstanding [Table Text Block]	The current unpaid principal balance and any related unamortized deferred fees and costs of total serviced automotive finance loans and leases outstanding were as follows. ($ in millions) June 30, 2016 December 31, 2015 On-balance sheet automotive finance loans and leases Consumer automotive $ 63,113 $ 64,067 Commercial automotive 35,251 34,895 Operating leases 13,527 15,965 Other 61 72 Off-balance sheet automotive finance loans Securitizations 3,252 2,550 Whole-loan 4,066 2,259 Total serviced automotive finance loans and leases $ 119,270 $ 119,808

Other Assets (Tables)

Other Assets (Tables)	6 Months Ended
	Jun. 30, 2016
Other Assets [Abstract]
Schedule of Other Assets [Table Text Block]	The components of other assets were as follows. ($ in millions) June 30, 2016 December 31, 2015 Property and equipment at cost $ 781 $ 691 Accumulated depreciation (487 ) (456 ) Net property and equipment 294 235 Restricted cash collections for securitization trusts (a) 1,597 2,010 Net deferred tax assets 1,077 1,369 Nonmarketable equity investments (b) 772 418 Accrued interest and rent receivables 404 402 Goodwill (c) 220 27 Fair value of derivative contracts in receivable position (d) 209 233 Cash reserve deposits held-for-securitization trusts (e) 197 252 Other accounts receivable 166 158 Restricted cash and cash equivalents 106 120 Cash collateral placed with counterparties 91 125 Other assets 1,121 972 Total other assets $ 6,254 $ 6,321 (a) Represents cash collections from customer payments on securitized receivables. These funds are distributed to investors as payments on the related secured debt. (b) Includes investments in FHLB stock of $310 million and $391 million and FRB stock of $435 million and $0 million at June 30, 2016 , and December 31, 2015 , respectively. (c) Includes goodwill of $27 million at our Insurance operations at both June 30, 2016 , and December 31, 2015 , and $193 million and $0 million within Corporate and Other at June 30, 2016 , and December 31, 2015 , respectively. As a result of our acquisition of TradeKing, we recognized $193 million of goodwill within Corporate and Other on June 1, 2016 . No other changes in the carrying amount of goodwill were recorded during the six months ended June 30, 2016 . Refer to Note 2 for further discussion. (d) For additional information on derivative instruments and hedging activities, refer to Note 20 . (e) Represents credit enhancement in the form of cash reserves for various securitization transactions.

Deposit Liabilities (Tables)

Deposit Liabilities (Tables)	6 Months Ended
	Jun. 30, 2016
Deposits [Abstract]
Schedule of Deposit Liabilities [Table Text Block]	Deposit liabilities consisted of the following. ( $ in millions ) June 30, 2016 December 31, 2015 Noninterest-bearing deposits $ 94 $ 89 Interest-bearing deposits Savings and money market checking accounts 42,185 36,386 Certificates of deposit 30,323 29,774 Dealer deposits 200 229 Total deposit liabilities $ 72,802 $ 66,478

Short-Term Borrowings (Tables)

Short-Term Borrowings (Tables)	6 Months Ended
	Jun. 30, 2016
Short-term Debt [Abstract]
Schedule of Short-term Debt [Table Text Block]	The following table presents the composition of our short-term borrowings portfolio. June 30, 2016 December 31, 2015 ($ in millions) Unsecured Secured (a) Total Unsecured Secured (a) Total Demand notes $ 3,576 $ — $ 3,576 $ 3,369 $ — $ 3,369 Federal Home Loan Bank — 1,950 1,950 — 4,000 4,000 Securities sold under agreements to repurchase — 468 468 — 648 648 Other — — — 84 — 84 Total short-term borrowings $ 3,576 $ 2,418 $ 5,994 $ 3,453 $ 4,648 $ 8,101 (a) Refer to Note 14 for further details on assets restricted as collateral for payment of the related debt.

Long-Term Debt (Tables)

Long-Term Debt (Tables)	6 Months Ended
	Jun. 30, 2016
Long-term Debt, Unclassified [Abstract]
Long-term Debt Portfolio [Table Text Block]	The following table presents the composition of our long-term debt portfolio. June 30, 2016 December 31, 2015 ($ in millions) Unsecured Secured Total Unsecured Secured Total Long-term debt Due within one year $ 4,363 $ 10,496 $ 14,859 $ 1,829 $ 9,427 $ 11,256 Due after one year (a) 16,683 28,961 45,644 18,803 35,844 54,647 Fair value adjustment (b) 520 17 537 334 (3 ) 331 Total long-term debt (c) $ 21,566 $ 39,474 $ 61,040 $ 20,966 $ 45,268 $ 66,234 (a) Includes $2.6 billion of trust preferred securities at both June 30, 2016 , and December 31, 2015 . (b) Represents the fair value adjustment associated with the application of hedge accounting on certain of our long-term debt positions. Refer to Note 20 for additional information. (c) Includes advances from the Federal Home Loan Bank of Pittsburgh of $5.4 billion at both June 30, 2016 , and December 31, 2015 .
Scheduled Remaining Maturity of Long-term Debt [Table Text Block]	The following table presents the scheduled remaining maturity of long-term debt at June 30, 2016 , assuming no early redemptions will occur. The actual payment of secured debt may vary based on the payment activity of the related pledged assets. ($ in millions) 2016 2017 2018 2019 2020 2021 and Fair value Total Unsecured Long-term debt $ 1,419 $ 4,365 $ 3,700 $ 1,650 $ 2,212 $ 9,067 $ 520 $ 22,933 Original issue discount (40 ) (88 ) (100 ) (37 ) (37 ) (1,065 ) — (1,367 ) Total unsecured 1,379 4,277 3,600 1,613 2,175 8,002 520 21,566 Secured Long-term debt 3,880 12,140 8,536 7,195 4,087 3,619 17 39,474 Total long-term debt $ 5,259 $ 16,417 $ 12,136 $ 8,808 $ 6,262 $ 11,621 $ 537 $ 61,040
Pledged assets for the payment of the related secured borrowings and repurchase agreements [Table Text Block]	The following summarizes assets restricted as collateral for the payment of the related debt obligation primarily arising from securitization transactions accounted for as secured borrowings and repurchase agreements. June 30, 2016 December 31, 2015 ($ in millions) Total Ally Bank (a) Total Ally Bank (a) Investment securities (b) $ 437 $ — $ 2,420 $ 1,761 Mortgage assets held-for-investment and lending receivables 11,006 11,006 9,743 9,743 Consumer automotive finance receivables 30,911 8,451 34,324 9,167 Commercial automotive finance receivables 19,194 18,878 19,623 19,177 Investment in operating leases, net 3,777 2,059 5,539 3,205 Other assets (b) 46 — — — Total assets restricted as collateral (c) (d) $ 65,371 $ 40,394 $ 71,649 $ 43,053 Secured debt $ 41,892 (e) $ 19,960 $ 49,916 (e) $ 24,787 (a) Ally Bank is a component of the total column. (b) Certain investment securities and other assets are restricted under repurchase agreements. Refer to Note 13 for information on the repurchase agreements. (c) Ally Bank has an advance agreement with the FHLB, and had assets pledged to secure borrowings that were restricted as collateral to the FHLB totaling $14.6 billion and $14.9 billion at June 30, 2016 , and December 31, 2015 , respectively. These assets were composed primarily of consumer mortgage finance receivables and loans, net and investment securities. Ally Bank has access to the Federal Reserve Bank Discount Window. Ally Bank had assets pledged and restricted as collateral to the Federal Reserve Bank totaling $2.6 billion and $2.9 billion at June 30, 2016 , and December 31, 2015 , respectively. These assets were composed of consumer automotive finance receivables and loans, net and investment in operating leases, net. Availability under these programs is only for the operations of Ally Bank and cannot be used to fund the operations or liabilities of Ally or its subsidiaries. (d) Excludes restricted cash and cash reserves for securitization trusts recorded within other assets on the Condensed Consolidated Balance Sheet . Refer to Note 11 for additional information. (e) Includes $2.4 billion and $4.6 billion of short-term borrowings at June 30, 2016 , and December 31, 2015 , respectively.
Schedule Of Committed Funding Facilities [Table Text Block]	Outstanding Unused capacity (a) Total capacity ($ in millions) June 30, 2016 December 31, 2015 June 30, 2016 December 31, 2015 June 30, 2016 December 31, 2015 Bank funding Secured (b) $ 2,950 $ 3,250 $ 1,050 $ — $ 4,000 $ 3,250 Parent funding Secured 14,540 16,914 1,085 251 15,625 17,165 Total committed facilities $ 17,490 $ 20,164 $ 2,135 $ 251 $ 19,625 $ 20,415 (a) Funding from committed secured facilities is available on request in the event excess collateral resides in certain facilities or is available to the extent incremental collateral is available and contributed to the facilities. (b) Excludes off-balance sheet credit facility amounts.

Accrued Expenses and Other Li49

Accrued Expenses and Other Liabilities (Tables)	6 Months Ended
	Jun. 30, 2016
Accounts Payable and Accrued Liabilities [Abstract]
Schedule of Accrued Liabilities [Table Text Block]	The components of accrued expenses and other liabilities were as follows. ($ in millions) June 30, 2016 December 31, 2015 Accounts payable $ 497 $ 391 Employee compensation and benefits 196 242 Reserves for insurance losses and loss adjustment expenses 164 169 Cash collateral received from counterparties 146 82 Fair value of derivative contracts in payable position (a) 87 145 Deferred revenue 78 108 Other liabilities 424 408 Total accrued expenses and other liabilities $ 1,592 $ 1,545 (a) For additional information on derivative instruments and hedging activities, refer to Note 20 .

Preferred Stock (Tables)

Preferred Stock (Tables)	6 Months Ended
	Jun. 30, 2016
Preferred Stock, Including Additional Paid in Capital [Abstract]
Schedule of Stock by Class [Table Text Block]	The following table summarizes information about our Series A Preferred Stock. June 30, 2016 December 31, 2015 Series A preferred stock Carrying value ($ in millions) $ — $ 696 Par value (per share) — 0.01 Liquidation preference (per share) — 25 Number of shares authorized — 40,870,560 Number of shares issued and outstanding — 27,870,560 Dividend/coupon Prior to May 15, 2016 — % 8.5 % On and after May 15, 2016 — % Three month

Accumulated Other Comprehensi51

Accumulated Other Comprehensive Income (Loss) (Tables)	6 Months Ended
	Jun. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Abstract]
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]	The following table presents changes, net of tax, in each component of accumulated other comprehensive (loss) income. ($ in millions) Unrealized (losses) gains on investment securities (a) Translation adjustments and net investment hedges (b) Cash flow hedges Defined benefit pension plans Accumulated other comprehensive (loss) income Balance at December 31, 2014 $ (21 ) $ 36 $ 7 $ (88 ) $ (66 ) 2015 net change (97 ) (20 ) — — (117 ) Balance at June 30, 2015 $ (118 ) $ 16 $ 7 $ (88 ) $ (183 ) Balance at December 31, 2015 $ (159 ) $ 9 $ 8 $ (89 ) $ (231 ) 2016 net change 262 5 — (1 ) 266 Balance at June 30, 2016 $ 103 $ 14 $ 8 $ (90 ) $ 35 (a) Represents the after-tax difference between the fair value and amortized cost of our available-for-sale securities portfolio. (b) For additional information on derivative instruments and hedging activities, refer to Note 20 .
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]	The following tables present the before- and after-tax changes in each component of accumulated other comprehensive (loss) income. Three months ended June 30, 2016 ($ in millions) Before Tax Tax Effect After Tax Investment securities Net unrealized gains arising during the period $ 185 $ (25 ) $ 160 Less: Net realized gains reclassified to income from continuing operations 39 (a) 1 (b) 40 Net change 146 (26 ) 120 Translation adjustments Net unrealized losses arising during the period (1 ) — (1 ) Less: Net realized losses reclassified to income from discontinued operations, net of tax (1 ) — (1 ) Net change — — — Other comprehensive income $ 146 $ (26 ) $ 120 (a) Includes gains reclassified to other gain on investments, net in our Condensed Consolidated Statement of Comprehensive Income . (b) Includes amounts reclassified to income tax expense from continuing operations in our Condensed Consolidated Statement of Comprehensive Income . Three months ended June 30, 2015 ($ in millions) Before Tax Tax Effect After Tax Investment securities Net unrealized losses arising during the period $ (191 ) $ 71 $ (120 ) Less: Net realized gains reclassified to income from continuing operations 45 (a) (16 ) (b) 29 Net change (236 ) 87 (149 ) Translation adjustments Net unrealized gains arising during the period 4 (1 ) 3 Less: Net realized gains reclassified to income from discontinued operations, net of tax 1 — 1 Net change 3 (1 ) 2 Net investment hedges Net unrealized losses arising during the period (2 ) 1 (1 ) Other comprehensive loss $ (235 ) $ 87 $ (148 ) (a) Includes gains reclassified to other gain on investments, net in our Condensed Consolidated Statement of Comprehensive Income . (b) Includes amounts reclassified to income tax expense from continuing operations in our Condensed Consolidated Statement of Comprehensive Income . Six months ended June 30, 2016 ($ in millions) Before Tax Tax Effect After Tax Investment securities Net unrealized gains arising during the period $ 465 $ (129 ) $ 336 Less: Net realized gains reclassified to income from continuing operations 93 (a) (19 ) (b) 74 Net change 372 (110 ) 262 Translation adjustments Net unrealized gains arising during the period 12 (5 ) 7 Less: Net realized losses reclassified to income from discontinued operations, net of tax (1 ) — (1 ) Net change 13 (5 ) 8 Net investment hedges Net unrealized losses arising during the period (6 ) 3 (3 ) Defined benefit pension plans Net unrealized losses arising during the period (1 ) — (1 ) Other comprehensive income $ 378 $ (112 ) $ 266 (a) Includes gains reclassified to other gain on investments, net in our Condensed Consolidated Statement of Comprehensive Income. (b) Includes amounts reclassified to income tax expense (benefit) from continuing operations in our Condensed Consolidated Statement of Comprehensive Income. Six months ended June 30, 2015 ($ in millions) Before Tax Tax Effect After Tax Investment securities Net unrealized losses arising during the period $ (53 ) $ 20 $ (33 ) Less: Net realized gains reclassified to income from continuing operations 100 (a) (36 ) (b) 64 Net change (153 ) 56 (97 ) Translation adjustments Net unrealized losses arising during the period (16 ) 6 (10 ) Less: Net realized gains reclassified to income from discontinued operations, net of tax 43 (20 ) 23 Net change (59 ) 26 (33 ) Net investment hedges Net unrealized gains arising during the period 16 (6 ) 10 Less: Net realized losses reclassified to income from discontinued operations, net of tax (4 ) 1 (3 ) Net change 20 (7 ) 13 Other comprehensive loss $ (192 ) $ 75 $ (117 ) (a) Includes gains reclassified to other gain on investments, net in our Condensed Consolidated Statement of Comprehensive Income. (b) Includes amounts reclassified to income tax expense (benefit) from continuing operations in our Condensed Consolidated Statement of Comprehensive Income.

Earnings Per Common Share (Tabl

Earnings Per Common Share (Tables)	6 Months Ended
	Jun. 30, 2016
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]	The following table presents the calculation of basic and diluted earnings per common share. Three months ended June 30, Six months ended June 30, ( $ in millions, except share data ) (a) 2016 2015 2016 2015 Net income from continuing operations $ 357 $ 169 $ 604 $ 348 Preferred stock dividends (b) (15 ) (1,251 ) (30 ) (1,318 ) Net income (loss) from continuing operations attributable to common shareholders 342 (1,082 ) 574 (970 ) Income from discontinued operations, net of tax 3 13 6 410 Net income (loss) attributable to common shareholders $ 345 $ (1,069 ) $ 580 $ (560 ) Basic weighted-average common shares outstanding (c) 485,370,318 482,847,164 484,801,782 482,550,842 Diluted weighted-average common shares outstanding (c) (d) 486,074,474 482,847,164 485,364,351 482,550,842 Basic earnings per common share Net income (loss) from continuing operations $ 0.70 $ (2.24 ) $ 1.18 $ (2.01 ) Income from discontinued operations, net of tax 0.01 0.03 0.01 0.85 Net income (loss) $ 0.71 $ (2.22 ) $ 1.20 $ (1.16 ) Diluted earnings per common share Net income (loss) from continuing operations $ 0.70 $ (2.24 ) $ 1.18 $ (2.01 ) Income from discontinued operations, net of tax 0.01 0.03 0.01 0.85 Net income (loss) $ 0.71 $ (2.22 ) $ 1.19 $ (1.16 ) (a) Figures in the table may not recalculate exactly due to rounding. Earnings per share is calculated based on unrounded numbers. (b) Preferred stock dividends for the three months and six months ended June 30, 2015 , include $1,193 million recognized in connection with the partial redemption of the Series G Preferred Stock and the repurchase of the Series A Preferred Stock. These dividends represent an additional return to preferred shareholders calculated as the excess consideration paid over the carrying amount derecognized. (c) Includes shares related to share-based compensation that vested but were not yet issued for the three months and six months ended June 30, 2016 , and 2015 , respectively. (d) Due to antidilutive effect of the net loss from continuing operations attributable to common shareholders for the three months and six months ended June 30, 2015 , basic weighted-average common shares outstanding were used to calculate basic and diluted earnings per share.

Regulatory Capital (Tables)

Regulatory Capital (Tables)	6 Months Ended
	Jun. 30, 2016
Regulatory Capital Requirements [Abstract]
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block]	The following table summarizes our capital ratios under the U.S. Basel III capital framework. June 30, 2016 December 31, 2015 Required Well-capitalized ( $ in millions ) Amount Ratio Amount Ratio Capital ratios Common Equity Tier 1 (to risk-weighted assets) Ally Financial Inc. $ 12,829 9.59 % $ 12,507 9.21 % 4.50 % (a) Ally Bank 17,209 17.64 16,594 17.05 4.50 6.50 % Tier 1 (to risk-weighted assets) Ally Financial Inc. $ 14,959 11.18 % $ 15,077 11.10 % 6.00 % 6.00 % Ally Bank 17,209 17.64 16,594 17.05 6.00 8.00 Total (to risk-weighted assets) Ally Financial Inc. $ 17,166 12.83 % $ 17,005 12.52 % 8.00 % 10.00 % Ally Bank 17,712 18.15 17,043 17.51 8.00 10.00 Tier 1 leverage (to adjusted quarterly average assets) (b) Ally Financial Inc. $ 14,959 9.63 % $ 15,077 9.73 % 4.00 % (a) Ally Bank 17,209 15.31 16,594 15.38 15.00 (c) 5.00 % (a) Currently, there is no ratio component for determining whether a BHC is "well-capitalized." (b) Federal regulatory reporting guidelines require the calculation of adjusted quarterly average assets using a daily average methodology. (c) Ally Bank has committed to the FRB to maintain a Tier 1 leverage ratio of at least 15% .

Derivative Instruments and He54

Derivative Instruments and Hedging Activities (Tables)	6 Months Ended
	Jun. 30, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Fair Value Amounts of Derivative Instruments Reported On Our Condensed Consolidated Balance Sheet [Table Text Block]	The following table summarizes the fair value amounts of derivative instruments reported on our Condensed Consolidated Balance Sheet . The fair value amounts are presented on a gross basis, are segregated by derivatives that are designated and qualifying as hedging instruments or those that are not, and are further segregated by type of contract within those two categories. Notional amounts are reference amounts from which contractual obligations are derived and are not recorded on the balance sheet. In our view, derivative notional is not an accurate measure of our derivative exposure when viewed in isolation from other factors, such as market rate fluctuations and counterparty credit risk. June 30, 2016 December 31, 2015 Derivative contracts in a Notional Derivative contracts in a Notional ( $ in millions ) receivable payable receivable payable Derivatives designated as accounting hedges Interest rate contracts Swaps (c) (d) (e) $ 164 $ 22 $ 8,101 $ 126 $ 9 $ 14,151 Foreign exchange contracts Forwards 4 — 212 — 1 189 Total derivatives designated as accounting hedges 168 22 8,313 126 10 14,340 Derivatives not designated as accounting hedges Interest rate contracts Swaps 17 39 1,461 30 51 6,101 Futures and forwards 1 — 501 2 2 1,905 Written options — 18 16,920 — 72 18,220 Purchased options 18 — 16,920 73 — 18,240 Total interest rate risk 36 57 35,802 105 125 44,466 Foreign exchange contracts Futures and forwards 3 2 127 — — 278 Total foreign exchange risk 3 2 127 — — 278 Equity contracts Forwards — 5 17 — 9 32 Written options — 1 1 — 1 — Purchased options 2 — — 2 — — Total equity risk 2 6 18 2 10 32 Total derivatives not designated as accounting hedges 41 65 35,947 107 135 44,776 Total derivatives $ 209 $ 87 $ 44,260 $ 233 $ 145 $ 59,116 (a) Derivative contracts in a receivable position are classified as other assets on the Condensed Consolidated Balance Sheet , and includes accrued interest of $15 million and $46 million at June 30, 2016 , and December 31, 2015 , respectively. (b) Derivative contracts in a liability position are classified as accrued expenses and other liabilities on the Condensed Consolidated Balance Sheet , and includes accrued interest of $4 million and $12 million at June 30, 2016 , and December 31, 2015 , respectively. (c) Includes fair value hedges consisting of receive-fixed swaps on fixed-rate unsecured debt obligations with $146 million and $112 million in a receivable position, $0 million and $3 million in a payable position, and a $2.6 billion and $6.8 billion notional amount at June 30, 2016 , and December 31, 2015 , respectively. The hedge notional amount of $2.6 billion at June 30, 2016 , is associated with debt maturing in five or more years. (d) Includes fair value hedges consisting of receive-fixed swaps on fixed-rate secured debt obligations (FHLB Advances) with $18 million and $1 million in a receivable position, $0 million and $2 million in a payable position, and a $698 million and $500 million notional amount at June 30, 2016 , and December 31, 2015 , respectively. (e) Other fair value hedges include pay-fixed swaps on portfolios of held-for-investment automotive loan assets with $0 million and $13 million in a receivable position, $22 million and $3 million in a payable position, and a $4.8 billion and $6.8 billion notional amount at June 30, 2016 , and December 31, 2015 , respectively.
Gains and Losses On Derivative Instruments Reported in Statement of Comprehensive Income [Table Text Block]	The following table summarizes the location and amounts of gains and losses on derivative instruments reported in our Condensed Consolidated Statement of Comprehensive Income . Three months ended June 30, Six months ended June 30, ( $ in millions ) 2016 2015 2016 2015 Derivatives qualifying for hedge accounting (Loss) gain recognized in earnings on derivatives Interest rate contracts Interest and fees on finance receivables and loans (a) $ (6 ) $ 7 $ (34 ) $ (16 ) Interest on long-term debt (b) (c) 51 (97 ) 242 (11 ) Gain (loss) recognized in earnings on hedged items Interest rate contracts Interest and fees on finance receivables and loans (d) 5 2 33 35 Interest on long-term debt (e) (50 ) 94 (246 ) 7 Total derivatives qualifying for hedge accounting — 6 (5 ) 15 Derivatives not designated as accounting hedges Gain (loss) recognized in earnings on derivatives Interest rate contracts Gain on mortgage and automotive loans, net — 2 — — Other income, net of losses 1 3 3 (9 ) Total interest rate contracts 1 5 3 (9 ) Foreign exchange contracts (f) Interest on long-term debt (1 ) 5 (2 ) (138 ) Other income, net of losses 1 (3 ) (3 ) 8 Total foreign exchange contracts — 2 (5 ) (130 ) Equity contracts Compensation and benefits expense (1 ) 3 (2 ) (3 ) Total equity contracts (1 ) 3 (2 ) (3 ) Gain (loss) recognized in earnings on derivatives $ — $ 16 $ (9 ) $ (127 ) (a) Amounts exclude losses related to interest for qualifying accounting hedges of retail automotive loans held-for-investment, which are primarily offset by the fixed coupon payments of the loans. The losses were $5 million and $15 million for the three months ended June 30, 2016 , and 2015 , respectively, and $12 million and $32 million for the six months ended June 30, 2016 , and 2015 , respectively. (b) Amounts exclude gains related to interest for qualifying accounting hedges of unsecured debt, which are primarily offset by the fixed coupon payment on the long-term debt. The gains were $11 million and $24 million for the three months ended June 30, 2016 , and 2015 , respectively, and $27 million and $47 million for the six months ended June 30, 2016 , and 2015 , respectively. (c) Amounts exclude gains related to interest for qualifying accounting hedges of secured debt (FHLB Advances), which are primarily offset by the fixed coupon payment on the long-term debt. The gains were $2 million and $3 million for the three months and six months ended June 30, 2016 . (d) Amounts exclude losses related to amortization of deferred loan basis adjustments on the de-designated hedged item of $4 million and $1 million for the three months ended June 30, 2016 , and 2015 , respectively, and $9 million and $1 million for the six months ended June 30, 2016 , and 2015 , respectively. (e) Amounts exclude gains related to amortization of deferred debt basis adjustments on the de-designated hedged item of $21 million and $16 million for the three months ended June 30, 2016 , and 2015 , respectively, and $39 million and $44 million for the six months ended June 30, 2016 , and 2015 , respectively. (f) Amounts exclude gains and losses related to the revaluation of the related foreign-denominated debt or receivable. The losses were $1 million for the three months ended June 30, 2016 , and three months ended 2015 ,
Derivative Instruments Used in Cash Flow and Net Investment Hedge Accounting Relationships [Table Text Block]	The following table summarizes derivative instruments used in cash flow and net investment hedge accounting relationships. Three months ended June 30, Six months ended June 30, ( $ in millions ) 2016 2015 2016 2015 Foreign exchange contracts Loss reclassified from accumulated other comprehensive loss to income from discontinued operations, net $ — $ — $ — $ (4 ) Total loss from discontinued operations, net $ — $ — $ — $ (4 ) (Loss) gain recognized in other comprehensive income (a) $ — $ (2 ) $ (6 ) $ 20 (a) The amounts represent the effective portion of net investment hedges. There are offsetting amounts recognized in accumulated other comprehensive income (loss) related to the revaluation of the related net investment in foreign operations, including the tax impacts of the hedge and related net investment, as disclosed separately in Note 17 . There were gains of $0 million and losses of $3 million for the three months ended June 30, 2016 , and 2015 , respectively.

Fair Value (Tables)

Fair Value (Tables)	6 Months Ended
	Jun. 30, 2016
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value Measurements - Recurring Basis [Table Text Block]	The following tables display the assets and liabilities measured at fair value on a recurring basis including financial instruments elected for the fair value option. We often economically hedge the fair value change of our assets or liabilities with derivatives and other financial instruments. The tables below display the hedges separately from the hedged items; therefore, they do not directly display the impact of our risk management activities. Recurring fair value measurements June 30, 2016 ($ in millions) Level 1 Level 2 Level 3 Total Assets Investment securities Available-for-sale securities Debt securities U.S. Treasury and federal agencies $ 275 $ — $ — $ 275 U.S. States and political subdivisions — 733 — 733 Foreign government 11 180 — 191 Mortgage-backed residential — 12,617 — 12,617 Mortgage-backed commercial — 506 — 506 Asset-backed — 1,674 — 1,674 Corporate debt — 1,602 — 1,602 Total debt securities 286 17,312 — 17,598 Equity securities (a) 599 — — 599 Total available-for-sale securities 885 17,312 — 18,197 Other assets Interests retained in financial asset sales — — 31 31 Derivative contracts in a receivable position (b) Interest rate 1 199 — 200 Foreign currency — 7 — 7 Other 2 — — 2 Total derivative contracts in a receivable position 3 206 — 209 Total assets $ 888 $ 17,518 $ 31 $ 18,437 Liabilities Accrued expenses and other liabilities Derivative contracts in a payable position (b) Interest rate $ — $ (79 ) $ — $ (79 ) Foreign currency — (2 ) — (2 ) Other (1 ) (5 ) — (6 ) Total derivative contracts in a payable position (1 ) (86 ) — (87 ) Total liabilities $ (1 ) $ (86 ) $ — $ (87 ) (a) Our investment in any one industry did not exceed 18% . (b) For additional information on derivative instruments and hedging activities, refer to Note 20 . Recurring fair value measurements December 31, 2015 ($ in millions) Level 1 Level 2 Level 3 Total Assets Investment securities Available-for-sale securities Debt securities U.S. Treasury and federal agencies $ 1,469 $ 272 $ — $ 1,741 U.S. States and political subdivisions — 716 — 716 Foreign government 10 167 — 177 Mortgage-backed residential — 10,366 — 10,366 Mortgage-backed commercial — 481 — 481 Asset-backed — 1,755 — 1,755 Corporate debt — 1,204 — 1,204 Total debt securities 1,479 14,961 — 16,440 Equity securities (a) 717 — — 717 Total available-for-sale securities 2,196 14,961 — 17,157 Other assets Interests retained in financial asset sales — — 40 40 Derivative contracts in a receivable position (b) Interest rate 2 229 — 231 Other 2 — — 2 Total derivative contracts in a receivable position 4 229 — 233 Total assets $ 2,200 $ 15,190 $ 40 $ 17,430 Liabilities Accrued expenses and other liabilities Derivative contracts in a payable position (b) Interest rate $ (2 ) $ (133 ) $ — $ (135 ) Foreign currency — (1 ) — (1 ) Other (1 ) (8 ) — (9 ) Total derivative contracts in a payable position (3 ) (142 ) — (145 ) Total liabilities $ (3 ) $ (142 ) $ — $ (145 ) (a) Our investment in any one industry did not exceed 14% . (b) For additional information on derivative instruments and hedging activities, refer to Note 20 .
Fair Value Measurements - Reconciliation of Level 3 Assets and Liabilities [Table Text Block]	The following tables present the reconciliation for all Level 3 assets and liabilities measured at fair value on a recurring basis. We often economically hedge the fair value change of our assets or liabilities with derivatives and other financial instruments. The Level 3 items presented below may be hedged by derivatives and other financial instruments that are classified as Level 1 or Level 2. Thus, the following tables do not fully reflect the impact of our risk management activities. Level 3 recurring fair value measurements Net realized/unrealized Fair value at Net unrealized gains included in earnings ($ in millions) Fair value at April 1, 2016 included in earnings included in OCI Purchases Sales Issuances Settlements Assets Other assets Interests retained in financial asset sales $ 31 $ 1 (a) $ — $ — $ 2 $ — $ (3 ) $ 31 $ — Total assets $ 31 $ 1 $ — $ — $ 2 $ — $ (3 ) $ 31 $ — (a) Reported as other income, net of losses, in the Condensed Consolidated Statement of Comprehensive Income. Level 3 recurring fair value measurements Fair value at April 1, 2015 Net realized/unrealized gains Purchases Sales Issuances Settlements Fair value at Net unrealized gains included in earnings ($ in millions) included in earnings included in OCI Assets Mortgage loans held-for-sale, net $ 3 $ 1 (a) $ — $ — $ — $ — $ — $ 4 $ 1 Other assets Interests retained in financial asset sales 42 4 (a) — — — — (14 ) 32 — Total assets $ 45 $ 5 $ — $ — $ — $ — $ (14 ) $ 36 $ 1 (a) Reported as other income, net of losses, in the Condensed Consolidated Statement of Comprehensive Income. Level 3 recurring fair value measurements Net realized/unrealized Fair value at Net unrealized gains included in earnings ($ in millions) Fair value at Jan. 1, 2016 included in earnings included in OCI Purchases Sales Issuances Settlements Assets Other assets Interests retained in financial asset sales $ 40 $ 3 (a) $ — $ — $ 6 $ — $ (18 ) $ 31 $ — Total assets $ 40 $ 3 $ — $ — $ 6 $ — $ (18 ) $ 31 $ — (a) Reported as other income, net of losses, in the Condensed Consolidated Statement of Comprehensive Income. Level 3 recurring fair value measurements Fair value at Jan. 1, 2015 Net realized/unrealized Purchases Sales Issuances Settlements Fair value at Net unrealized gains included in earnings ($ in millions) included in earnings included in OCI Assets Mortgage loans held-for-sale, net $ 3 $ 1 (a) $ — $ — $ — $ — $ — $ 4 $ 1 Other assets Interests retained in financial asset sales 47 7 (a) — — — 1 (23 ) 32 — Total assets $ 50 $ 8 $ — $ — $ — $ 1 $ (23 ) $ 36 $ 1 (a) Reported as other income, net of losses, in the Condensed Consolidated Statement of Comprehensive Income
Fair Value Measurements - Nonrecurring Basis [Table Text Block]	The following tables display the assets and liabilities measured at fair value on a nonrecurring basis. Nonrecurring Lower-of-cost or Total gain included in earnings for Total gain included in earnings for the six months ended June 30, 2016 ($ in millions) Level 1 Level 2 Level 3 Total Assets Loans held-for-sale, net $ — $ — $ 15 $ 15 $ — n/m (a) n/m (a) Commercial finance receivables and loans, net (b) Automotive — — 43 43 (6 ) n/m (a) n/m (a) Other — — 46 46 (18 ) n/m (a) n/m (a) Total commercial finance receivables and loans, net — — 89 89 (24 ) n/m (a) n/m (a) Other assets Repossessed and foreclosed assets (c) — — 10 10 (3 ) n/m (a) n/m (a) Other — — 5 5 — n/m (a) n/m (a) Total assets $ — $ — $ 119 $ 119 $ (27 ) n/m n/m n/m = not meaningful (a) We consider the applicable valuation or loan loss allowance to be the most relevant indicator of the impact on earnings caused by the fair value measurement. Accordingly, the table above excludes total gains and losses included in earnings for these items. The carrying values are inclusive of the respective valuation or loan loss allowance. (b) Represents the portion of the portfolio specifically impaired during 2016 . The related valuation allowance represents the cumulative adjustment to fair value of those specific receivables. (c) The allowance provided for repossessed and foreclosed assets represents any cumulative valuation adjustment recognized to adjust the assets to fair value. Nonrecurring Lower-of-cost or Total gain included in earnings for Total gain included in earnings for the six months ended June 30, 2015 ($ in millions) Level 1 Level 2 Level 3 Total Assets Loans held-for-sale, net Automotive $ — $ — $ 1,356 $ 1,356 $ (12 ) n/m (a) n/m (a) Mortgage — — 10 10 (1 ) n/m (a) n/m (a) Other — — 36 36 — n/m (a) n/m (a) Total loans held-for-sale, net — — 1,402 1,402 (13 ) n/m (a) n/m (a) Commercial finance receivables and loans, net (b) Automotive — — 24 24 (8 ) n/m (a) n/m (a) Other — — 34 34 (11 ) n/m (a) n/m (a) Total commercial finance receivables and loans, net — — 58 58 (19 ) n/m (a) n/m (a) Other assets Repossessed and foreclosed assets (c) — — 10 10 (3 ) n/m (a) n/m (a) Other — — 2 2 — n/m (a) n/m (a) Total assets $ — $ — $ 1,472 $ 1,472 $ (35 ) n/m n/m n/m = not meaningful (a) We consider the applicable valuation or loan loss allowance to be the most relevant indicator of the impact on earnings caused by the fair value measurement. Accordingly, the table above excludes total gains and losses included in earnings for these items. The carrying values are inclusive of the respective valuation or loan loss allowance. (b) Represents the portion of the portfolio specifically impaired during 2015 . The related valuation allowance represents the cumulative adjustment to fair value of those specific receivables. (c) The allowance provided for repossessed and foreclosed assets represents any cumulative valuation adjustment recognized to adjust the assets to fair value.
Fair Value Measurements - Nonrecurring Fair Value Inputs [Table Text Block]	The following table presents quantitative information regarding the significant unobservable inputs used in significant Level 3 assets measured at fair value on a nonrecurring basis. June 30, 2015 ( $ in millions ) Level 3 nonrecurring measurements Valuation technique Unobservable input Weighted average/range Assets Automotive loans held-for-sale, net $ 1,356 Discounted cash flow Prepayment rate 1.30% Gross loss 0-4.50% Credit spread 0-6.70%
Fair Value of Financial Intruments [Table Text Block]	The following table presents the carrying and estimated fair value of financial instruments, except for those recorded at fair value on a recurring basis presented in the previous section of this note titled Recurring Fair Value. When possible, we use quoted market prices to determine fair value. Where quoted market prices are not available, the fair value is internally derived based on appropriate valuation methodologies with respect to the amount and timing of future cash flows and estimated discount rates. However, considerable judgment is required in interpreting current market data to develop the market assumptions and inputs necessary to estimate fair value. As such, the actual amount received to sell an asset or the amount paid to settle a liability could differ from our estimates. Fair value information presented herein was based on information available at June 30, 2016 , and December 31, 2015 . Estimated fair value ($ in millions) Carrying value Level 1 Level 2 Level 3 Total June 30, 2016 Financial assets Held-to-maturity securities $ 571 $ — $ 579 $ — $ 579 Loans held-for-sale, net 15 — — 15 15 Finance receivables and loans, net 111,564 — — 112,632 112,632 Nonmarketable equity investments 772 — 745 43 788 Financial liabilities Deposit liabilities $ 72,802 $ — $ — $ 73,528 $ 73,528 Short-term borrowings 5,994 — — 5,996 5,996 Long-term debt 61,040 — 23,407 39,574 62,981 December 31, 2015 Financial assets Loans held-for-sale, net $ 105 $ — $ — $ 105 $ 105 Finance receivables and loans, net 110,546 — — 110,737 110,737 Nonmarketable equity investments 418 — 391 42 433 Financial liabilities Deposit liabilities $ 66,478 $ — $ — $ 66,889 $ 66,889 Short-term borrowings 8,101 — — 8,102 8,102 Long-term debt 66,234 — 23,018 45,157 68,175

Offsetting Assets and Liabili56

Offsetting Assets and Liabilities (Tables)	6 Months Ended
	Jun. 30, 2016
Offsetting [Abstract]
Offsetting Assets and Liabilities [Table Text Block]	The composition of offsetting derivative instruments, financial assets, and financial liabilities was as follows. Gross amounts of recognized assets/(liabilities) Gross amounts offset in the Condensed Consolidated Balance Sheet Net amounts of assets/(liabilities) Gross amounts not offset in the Condensed Consolidated Balance Sheet June 30, 2016 ( $ in millions ) Financial instruments Collateral (a) (b) (c) Net amount Assets Derivative assets in net asset positions $ 207 $ — $ 207 $ (44 ) $ (143 ) $ 20 Derivative assets in net liability positions 2 — 2 (1 ) — 1 Total assets (d) $ 209 $ — $ 209 $ (45 ) $ (143 ) $ 21 Liabilities Derivative liabilities in net liability positions $ (38 ) $ — $ (38 ) $ 1 $ 21 $ (16 ) Derivative liabilities in net asset positions (44 ) — (44 ) 44 — — Derivative liabilities with no offsetting arrangements (5 ) — (5 ) — — (5 ) Total derivative liabilities (d) (87 ) — (87 ) 45 21 (21 ) Securities sold under agreements to repurchase (e) (468 ) — (468 ) — 468 — Total liabilities $ (555 ) $ — $ (555 ) $ 45 $ 489 $ (21 ) (a) Financial collateral received/pledged shown as a balance based on the sum of all net asset and liability positions between Ally and each individual derivative counterparty. (b) Amounts disclosed are limited to the financial asset or liability balance and, accordingly, exclude excess collateral received or pledged and noncash collateral received. $2 million of noncash derivative collateral pledged to us was excluded at June 30, 2016 . We do not record such collateral received on our Condensed Consolidated Balance Sheet unless certain conditions are met. (c) Certain agreements grant us the right to sell or pledge the noncash assets we receive as collateral. Noncash collateral pledged to us where the agreement grants us the right to sell or pledge the underlying assets had a fair value of $2 million at June 30, 2016 . We have not sold or pledged any of the noncash collateral received under these agreements as of June 30, 2016 . (d) For additional information on derivative instruments and hedging activities, refer to Note 20 . (e) For additional information on securities sold under agreements to repurchase, refer to Note 13 . Gross amounts of recognized assets/(liabilities) Gross amounts offset in the Condensed Consolidated Balance Sheet Net amounts of assets/(liabilities) Gross amounts not offset in the Condensed Consolidated Balance Sheet December 31, 2015 ( $ in millions ) Financial instruments Collateral Net amount Assets Derivative assets in net asset positions $ 224 $ — $ 224 $ (69 ) $ (67 ) $ 88 Derivative assets in net liability positions 9 — 9 (9 ) — — Total assets (d) $ 233 $ — $ 233 $ (78 ) $ (67 ) $ 88 Liabilities Derivative liabilities in net liability positions $ (68 ) $ — $ (68 ) $ 9 $ 2 $ (57 ) Derivative liabilities in net asset positions (69 ) — (69 ) 69 — — Derivative liabilities with no offsetting arrangements (8 ) — (8 ) — — (8 ) Total derivative liabilities (d) (145 ) — (145 ) 78 2 (65 ) Securities sold under agreements to repurchase (e) (648 ) — (648 ) — 648 — Total liabilities $ (793 ) $ — $ (793 ) $ 78 $ 650 $ (65 ) (a) Financial collateral received/pledged shown as a balance based on the sum of all net asset and liability positions between Ally and each individual derivative counterparty. (b) Amounts disclosed are limited to the financial asset or liability balance and, accordingly, exclude excess collateral received or pledged and noncash collateral received. $7 million of noncash derivative collateral pledged to us was excluded at December 31, 2015. We do not record such collateral received on our Consolidated Balance Sheet unless certain conditions are met. (c) Certain agreements grant us the right to sell or pledge the noncash assets we receive as collateral. Noncash collateral pledged to us where the agreement grants us the right to sell or pledge the underlying assets had a fair value of $7 million at December 31, 2015. We have not sold or pledged any of the noncash collateral received under these agreements as of December 31, 2015. (d) For additional information on derivative instruments and hedging activities, refer to Note 20 . (e) For additional information on securities sold under agreements to repurchase, refer to Note 13 .

Segment And Geographic Inform57

Segment And Geographic Information (Tables)	6 Months Ended
	Jun. 30, 2016
Segment Reporting [Abstract]
Schedule of Segment Reporting Information, by Segment [Table Text Block]	Financial information for our reportable operating segments is summarized as follows. Three months ended June 30, ($ in millions) Automotive Finance operations Insurance operations Mortgage Finance operations Corporate Finance operations Corporate and Other Consolidated (a) 2016 Net financing revenue (loss) $ 929 $ 16 $ 26 $ 29 $ (16 ) $ 984 Other revenue 77 259 — 4 34 374 Total net revenue 1,006 275 26 33 18 1,358 Provision for loan losses 170 — — 3 (1 ) 172 Total noninterest expense 410 293 17 16 37 773 Income (loss) from continuing operations before income tax expense $ 426 $ (18 ) $ 9 $ 14 $ (18 ) $ 413 Total assets $ 112,356 $ 7,193 $ 8,014 $ 2,989 $ 27,379 $ 157,931 2015 Net financing revenue $ 850 $ 14 $ 11 $ 22 $ 19 $ 916 Other revenue (loss) 55 268 — 6 (118 ) 211 Total net revenue (loss) 905 282 11 28 (99 ) 1,127 Provision for loan losses 132 — 4 4 — 140 Total noninterest expense 400 267 10 14 33 724 Income (loss) from continuing operations before income tax expense $ 373 $ 15 $ (3 ) $ 10 $ (132 ) $ 263 Total assets $ 113,607 $ 7,260 $ 5,623 $ 2,132 $ 27,656 $ 156,278 (a) Net financing revenue after the provision for loan losses totaled $812 million and $776 million for the three months ended June 30, 2016 , and 2015 , respectively. Six months ended June 30, ($ in millions) Automotive Finance operations Insurance operations Mortgage Finance operations Corporate Finance operations Corporate and Other Consolidated (a) 2016 Net financing revenue (loss) $ 1,825 $ 30 $ 46 $ 57 $ (23 ) $ 1,935 Other revenue 154 513 — 10 73 750 Total net revenue 1,979 543 46 67 50 2,685 Provision for loan losses 379 — 3 9 1 392 Total noninterest expense 837 511 32 33 70 1,483 Income (loss) from continuing operations before income tax expense $ 763 $ 32 $ 11 $ 25 $ (21 ) $ 810 Total assets $ 112,356 $ 7,193 $ 8,014 $ 2,989 $ 27,379 $ 157,931 2015 Net financing revenue $ 1,659 $ 26 $ 22 $ 42 $ 17 $ 1,766 Other revenue (loss) 107 536 — 12 (201 ) 454 Total net revenue (loss) 1,766 562 22 54 (184 ) 2,220 Provision for loan losses 259 — 6 (1 ) (8 ) 256 Total noninterest expense 828 469 18 28 76 1,419 Income (loss) from continuing operations before income tax expense $ 679 $ 93 $ (2 ) $ 27 $ (252 ) $ 545 Total assets $ 113,607 $ 7,260 $ 5,623 $ 2,132 $ 27,656 $ 156,278 (a) Net financing revenue after the provision for loan losses totaled $1,543 million and $1,510 million for the six months ended June 30, 2016 , and 2015 , respectively.
Information Concerning Principal Geographic Areas [Table Text Block]	Information concerning principal geographic areas was as follows. Three months ended June 30, ($ in millions) Revenue (a) Income Net income (loss) (b) 2016 Canada $ 24 $ 12 $ 10 Europe — — (2 ) Total foreign (c) 24 12 8 Total domestic (d) 1,334 401 352 Total $ 1,358 $ 413 $ 360 2015 Canada $ 28 $ 13 $ 13 Europe — — 17 Total foreign (c) 28 13 30 Total domestic (d) 1,099 250 152 Total $ 1,127 $ 263 $ 182 (a) Revenue consists of net financing revenue and total other revenue as presented in our Condensed Consolidated Financial Statements . (b) Gain (loss) realized on sale of discontinued operations are allocated to the geographic area in which the business operated. (c) Our foreign operations as of June 30, 2016 , and June 30, 2015 , consist of our ongoing Insurance operations in Canada and our remaining international entities in wind-down. (d) Amounts include eliminations between our domestic and foreign operations. Six months ended June 30, ($ in millions) Revenue (a) Income Net income (loss) (b) 2016 Canada $ 45 $ 22 $ 18 Europe — — (3 ) Total foreign (c) 45 22 15 Total domestic (d) 2,640 788 595 Total $ 2,685 $ 810 $ 610 2015 Canada $ 52 $ 24 $ 21 Europe 1 4 28 Asia-Pacific — — 452 Total foreign (c) 53 28 501 Total domestic (d) 2,167 517 257 Total $ 2,220 $ 545 $ 758 (a) Revenue consists of net financing revenue and total other revenue as presented in our Condensed Consolidated Financial Statements . (b) Gain (loss) realized on sale of discontinued operations are allocated to the geographic area in which the business operated. (c) Our foreign operations as of June 30, 2016 , and June 30, 2015 , consist of our ongoing Insurance operations in Canada and our remaining international entities in wind-down. (d) Amounts include eliminations between our domestic and foreign operations.

Parent And Guarantor Consolid58

Parent And Guarantor Consolidating Financial Statements (Tables)	6 Months Ended
	Jun. 30, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Condensed Income Statement [Table Text Block]	Condensed Consolidating Statements of Comprehensive Income Three months ended June 30, 2016 ($ in millions) Parent Guarantors Nonguarantors Consolidating adjustments Ally consolidated Financing revenue and other interest income Interest and fees on finance receivables and loans $ (28 ) $ — $ 1,293 $ — $ 1,265 Interest and fees on finance receivables and loans — intercompany 3 — 2 (5 ) — Interest and dividends on investment securities — — 99 — 99 Interest on cash and cash equivalents 1 — 3 — 4 Interest-bearing cash — intercompany — — 2 (2 ) — Operating leases 5 — 696 — 701 Total financing revenue and other interest income (19 ) — 2,095 (7 ) 2,069 Interest expense Interest on deposits 2 — 201 — 203 Interest on short-term borrowings 10 — 2 — 12 Interest on long-term debt 290 — 146 — 436 Interest on intercompany debt 4 — 3 (7 ) — Total interest expense 306 — 352 (7 ) 651 Depreciation expense on operating lease assets 3 — 431 — 434 Net financing (loss) revenue (328 ) — 1,312 — 984 Cash dividends from subsidiaries Nonbank subsidiaries 148 — — (148 ) — Other revenue Insurance premiums and service revenue earned — — 236 — 236 (Loss) gain on mortgage and automotive loans, net (2 ) — 5 — 3 Other gain on investments, net — — 39 — 39 Other income, net of losses 317 — 214 (435 ) 96 Total other revenue 315 — 494 (435 ) 374 Total net revenue 135 — 1,806 (583 ) 1,358 Provision for loan losses 88 — 84 — 172 Noninterest expense Compensation and benefits expense 139 — 103 — 242 Insurance losses and loss adjustment expenses — — 145 — 145 Other operating expenses 317 — 502 (433 ) 386 Total noninterest expense 456 — 750 (433 ) 773 (Loss) income from continuing operations before income tax (benefit) expense and undistributed income (loss) of subsidiaries (409 ) — 972 (150 ) 413 Income tax (benefit) expense from continuing operations (65 ) (82 ) 203 — 56 Net (loss) income from continuing operations (344 ) 82 769 (150 ) 357 Income from discontinued operations, net of tax 3 — — — 3 Undistributed income (loss) of subsidiaries Bank subsidiary 336 336 — (672 ) — Nonbank subsidiaries 365 (2 ) — (363 ) — Net income 360 416 769 (1,185 ) 360 Other comprehensive income, net of tax 120 62 91 (153 ) 120 Comprehensive income $ 480 $ 478 $ 860 $ (1,338 ) $ 480 Three months ended June 30, 2015 ($ in millions) Parent Guarantors Nonguarantors Consolidating adjustments Ally consolidated Financing revenue and other interest income Interest and fees on finance receivables and loans $ (16 ) $ — $ 1,134 $ — $ 1,118 Interest and fees on finance receivables and loans — intercompany 2 — 5 (7 ) — Interest on loans held-for-sale — — 14 — 14 Interest and dividends on investment securities — — 93 — 93 Interest on cash and cash equivalents 1 — 1 — 2 Interest-bearing cash — intercompany — — 2 (2 ) — Operating leases — — 860 — 860 Total financing revenue and other interest income (13 ) — 2,109 (9 ) 2,087 Interest expense Interest on deposits 2 — 175 — 177 Interest on short-term borrowings 10 — 2 — 12 Interest on long-term debt 292 — 127 — 419 Interest on intercompany debt 6 — 3 (9 ) — Total interest expense 310 — 307 (9 ) 608 Depreciation expense on operating lease assets — — 563 — 563 Net financing (loss) revenue (323 ) — 1,239 — 916 Cash dividends from subsidiaries Bank subsidiaries 400 400 — (800 ) — Nonbank subsidiaries 248 — — (248 ) — Other revenue Insurance premiums and service revenue earned — — 237 — 237 Gain on mortgage and automotive loans, net — — 1 — 1 Loss on extinguishment of debt (156 ) — — — (156 ) Other gain on investments, net — — 45 — 45 Other income, net of losses 327 — 334 (577 ) 84 Total other revenue 171 — 617 (577 ) 211 Total net revenue 496 400 1,856 (1,625 ) 1,127 Provision for loan losses (36 ) — 176 — 140 Noninterest expense Compensation and benefits expense 139 — 197 (100 ) 236 Insurance losses and loss adjustment expenses — — 122 — 122 Other operating expenses 310 — 533 (477 ) 366 Total noninterest expense 449 — 852 (577 ) 724 Income from continuing operations before income tax (benefit) expense and undistributed (loss) income of subsidiaries 83 400 828 (1,048 ) 263 Income tax (benefit) expense from continuing operations (87 ) — 181 — 94 Net income from continuing operations 170 400 647 (1,048 ) 169 (Loss) income from discontinued operations, net of tax (15 ) — 28 — 13 Undistributed (loss) income of subsidiaries Bank subsidiary (132 ) (132 ) — 264 — Nonbank subsidiaries 159 — — (159 ) — Net income 182 268 675 (943 ) 182 Other comprehensive loss, net of tax (148 ) (67 ) (166 ) 233 (148 ) Comprehensive income $ 34 $ 201 $ 509 $ (710 ) $ 34 Six months ended June 30, 2016 ($ in millions) Parent Guarantors Nonguarantors Consolidating adjustments Ally consolidated Financing revenue and other interest income Interest and fees on finance receivables and loans $ (66 ) $ — $ 2,566 $ — $ 2,500 Interest and fees on finance receivables and loans — intercompany 6 — 4 (10 ) — Interest and dividends on investment securities — — 201 — 201 Interest on cash and cash equivalents 2 — 5 — 7 Interest-bearing cash — intercompany — — 5 (5 ) — Operating leases 10 — 1,460 — 1,470 Total financing revenue and other interest income (48 ) — 4,241 (15 ) 4,178 Interest expense Interest on deposits 4 — 392 — 396 Interest on short-term borrowings 20 — 5 — 25 Interest on long-term debt 578 — 300 — 878 Interest on intercompany debt 9 — 6 (15 ) — Total interest expense 611 — 703 (15 ) 1,299 Depreciation expense on operating lease assets 7 — 937 — 944 Net financing (loss) revenue (666 ) — 2,601 — 1,935 Cash dividends from subsidiaries Nonbank subsidiaries 629 — — (629 ) — Other revenue Insurance premiums and service revenue earned — — 466 — 466 (Loss) gain on mortgage and automotive loans, net (5 ) — 9 — 4 Loss on extinguishment of debt (2 ) — (2 ) — (4 ) Other gain on investments, net — — 93 — 93 Other income, net of losses 690 — 430 (929 ) 191 Total other revenue 683 — 996 (929 ) 750 Total net revenue 646 — 3,597 (1,558 ) 2,685 Provision for loan losses 148 — 244 — 392 Noninterest expense Compensation and benefits expense 286 — 208 — 494 Insurance losses and loss adjustment expenses — — 218 — 218 Other operating expenses 656 — 1,044 (929 ) 771 Total noninterest expense 942 — 1,470 (929 ) 1,483 (Loss) income from continuing operations before income tax (benefit) expense and undistributed income (loss) of subsidiaries (444 ) — 1,883 (629 ) 810 Income tax (benefit) expense from continuing operations (108 ) (82 ) 396 — 206 Net (loss) income from continuing operations (336 ) 82 1,487 (629 ) 604 Income (loss) from discontinued operations, net of tax 9 — (3 ) — 6 Undistributed income (loss) of subsidiaries Bank subsidiary 607 607 — (1,214 ) — Nonbank subsidiaries 330 (2 ) — (328 ) — Net income 610 687 1,484 (2,171 ) 610 Other comprehensive income, net of tax 266 145 243 (388 ) 266 Comprehensive income $ 876 $ 832 $ 1,727 $ (2,559 ) $ 876 Six months ended June 30, 2015 ($ in millions) Parent Guarantors Nonguarantors Consolidating adjustments Ally consolidated Financing revenue and other interest income Interest and fees on finance receivables and loans $ (12 ) $ — $ 2,204 $ — $ 2,192 Interest and fees on finance receivables and loans — intercompany 12 — 21 (33 ) — Interest on loans held-for-sale — — 38 — 38 Interest and dividends on investment securities — — 181 — 181 Interest on cash and cash equivalents 1 — 3 — 4 Interest-bearing cash — intercompany — — 4 (4 ) — Operating leases — — 1,756 — 1,756 Total financing revenue and other interest income 1 — 4,207 (37 ) 4,171 Interest expense Interest on deposits 5 — 344 — 349 Interest on short-term borrowings 20 — 3 — 23 Interest on long-term debt 584 — 264 — 848 Interest on intercompany debt 25 — 12 (37 ) — Total interest expense 634 — 623 (37 ) 1,220 Depreciation expense on operating lease assets — — 1,185 — 1,185 Net financing (loss) revenue (633 ) — 2,399 — 1,766 Cash dividends from subsidiaries Bank subsidiaries 525 525 — (1,050 ) — Nonbank subsidiaries 486 — — (486 ) — Other revenue Insurance premiums and service revenue earned — — 470 — 470 (Loss) gain on mortgage and automotive loans, net (8 ) — 55 — 47 Loss on extinguishment of debt (353 ) — (1 ) — (354 ) Other gain on investments, net — — 100 — 100 Other income, net of losses 678 — 690 (1,177 ) 191 Total other revenue 317 — 1,314 (1,177 ) 454 Total net revenue 695 525 3,713 (2,713 ) 2,220 Provision for loan losses 64 — 192 — 256 Noninterest expense Compensation and benefits expense 293 — 422 (224 ) 491 Insurance losses and loss adjustment expenses — — 178 — 178 Other operating expenses 620 — 1,083 (953 ) 750 Total noninterest expense 913 — 1,683 (1,177 ) 1,419 (Loss) income from continuing operations before income tax (benefit) expense and undistributed income of subsidiaries (282 ) 525 1,838 (1,536 ) 545 Income tax (benefit) expense from continuing operations (202 ) — 399 — 197 Net (loss) income from continuing operations (80 ) 525 1,439 (1,536 ) 348 Income from discontinued operations, net of tax 372 — 38 — 410 Undistributed income of subsidiaries Bank subsidiary 48 48 — (96 ) — Nonbank subsidiaries 418 — — (418 ) — Net income 758 573 1,477 (2,050 ) 758 Other comprehensive loss, net of tax (117 ) (25 ) (119 ) 144 (117 ) Comprehensive income $ 641 $ 548 $ 1,358 $ (1,906 ) $ 641
Condensed Balance Sheet [Table Text Block]	Condensed Consolidating Balance Sheet June 30, 2016 ($ in millions) Parent (a) Guarantors Nonguarantors (a) Consolidating adjustments Ally consolidated Assets Cash and cash equivalents Noninterest-bearing $ 796 $ — $ 994 $ — $ 1,790 Interest-bearing 700 — 3,241 — 3,941 Interest-bearing — intercompany — — 839 (839 ) — Total cash and cash equivalents 1,496 — 5,074 (839 ) 5,731 Available-for-sale securities — — 18,197 — 18,197 Held-to-maturity securities — — 571 — 571 Loans held-for-sale, net — — 15 — 15 Finance receivables and loans, net Finance receivables and loans, net 3,162 — 109,491 — 112,653 Intercompany loans to Bank subsidiary 1,400 — — (1,400 ) — Nonbank subsidiaries 2,319 — 561 (2,880 ) — Allowance for loan losses (76 ) — (1,013 ) — (1,089 ) Total finance receivables and loans, net 6,805 — 109,039 (4,280 ) 111,564 Investment in operating leases, net 59 — 13,696 — 13,755 Intercompany receivables from Bank subsidiary 293 — — (293 ) — Nonbank subsidiaries 91 — 124 (215 ) — Investment in subsidiaries Bank subsidiary 17,257 17,257 — (34,514 ) — Nonbank subsidiaries 10,837 1 — (10,838 ) — Premiums receivable and other insurance assets — — 1,868 (24 ) 1,844 Other assets 4,537 — 4,612 (2,895 ) 6,254 Total assets $ 41,375 $ 17,258 $ 153,196 $ (53,898 ) $ 157,931 Liabilities Deposit liabilities Noninterest-bearing $ — $ — $ 94 $ — $ 94 Interest-bearing 200 — 72,508 — 72,708 Total deposit liabilities 200 — 72,602 — 72,802 Short-term borrowings 3,576 — 2,418 — 5,994 Long-term debt 21,625 — 39,415 — 61,040 Intercompany debt to Nonbank subsidiaries 1,400 — 3,719 (5,119 ) — Intercompany payables to Bank subsidiary 203 — — (203 ) — Nonbank subsidiaries 164 — 165 (329 ) — Interest payable 251 — 176 — 427 Unearned insurance premiums and service revenue — — 2,465 — 2,465 Accrued expenses and other liabilities 345 — 4,142 (2,895 ) 1,592 Total liabilities 27,764 — 125,102 (8,546 ) 144,320 Total equity 13,611 17,258 28,094 (45,352 ) 13,611 Total liabilities and equity $ 41,375 $ 17,258 $ 153,196 $ (53,898 ) $ 157,931 (a) Amounts presented are based upon the legal transfer of the underlying assets to VIEs in order to reflect legal ownership. December 31, 2015 ($ in millions) Parent (a) Guarantors Nonguarantors (a) Consolidating adjustments Ally consolidated Assets Cash and cash equivalents Noninterest-bearing $ 1,234 $ — $ 914 $ — $ 2,148 Interest-bearing 401 — 3,831 — 4,232 Interest-bearing — intercompany — — 850 (850 ) — Total cash and cash equivalents 1,635 — 5,595 (850 ) 6,380 Available-for-sale securities — — 17,157 — 17,157 Loans held-for-sale, net — — 105 — 105 Finance receivables and loans, net Finance receivables and loans, net 2,636 — 108,964 — 111,600 Intercompany loans to Bank subsidiary 600 — — (600 ) — Nonbank subsidiaries 3,277 — 559 (3,836 ) — Allowance for loan losses (72 ) — (982 ) — (1,054 ) Total finance receivables and loans, net 6,441 — 108,541 (4,436 ) 110,546 Investment in operating leases, net 81 — 16,190 — 16,271 Intercompany receivables from Bank subsidiary 186 — — (186 ) — Nonbank subsidiaries 259 — 282 (541 ) — Investment in subsidiaries Bank subsidiary 16,496 16,496 — (32,992 ) — Nonbank subsidiaries 10,902 11 — (10,913 ) — Premiums receivable and other insurance assets — — 1,827 (26 ) 1,801 Other assets 4,785 — 4,488 (2,952 ) 6,321 Total assets $ 40,785 $ 16,507 $ 154,185 $ (52,896 ) $ 158,581 Liabilities Deposit liabilities Noninterest-bearing $ — $ — $ 89 $ — $ 89 Interest-bearing 229 — 66,160 — 66,389 Total deposit liabilities 229 — 66,249 — 66,478 Short-term borrowings 3,453 — 4,648 — 8,101 Long-term debt 21,048 — 45,186 — 66,234 Intercompany debt to Nonbank subsidiaries 1,409 — 3,877 (5,286 ) — Intercompany payables to Bank subsidiary 142 — — (142 ) — Nonbank subsidiaries 420 — 191 (611 ) — Interest payable 258 — 92 — 350 Unearned insurance premiums and service revenue — — 2,434 — 2,434 Accrued expenses and other liabilities 387 82 4,028 (2,952 ) 1,545 Total liabilities 27,346 82 126,705 (8,991 ) 145,142 Total equity 13,439 16,425 27,480 (43,905 ) 13,439 Total liabilities and equity $ 40,785 $ 16,507 $ 154,185 $ (52,896 ) $ 158,581 (a) Amounts presented are based upon the legal transfer of the underlying assets to VIEs in order to reflect legal ownership.
Condensed Cash Flow Statement [Table Text Block]	Condensed Consolidating Statement of Cash Flows Six months ended June 30, 2016 ($ in millions) Parent Guarantors Nonguarantors Consolidating adjustments Ally consolidated Operating activities Net cash provided by operating activities $ 132 $ — $ 2,919 $ (629 ) $ 2,422 Investing activities Purchases of available-for-sale securities — — (8,657 ) — (8,657 ) Proceeds from sales of available-for-sale securities — — 6,584 — 6,584 Proceeds from maturities and repayments of available-for-sale securities — — 1,536 — 1,536 Purchases of held-to-maturity securities — — (571 ) — (571 ) Net increase in finance receivables and loans (834 ) — (4,819 ) — (5,653 ) Proceeds from sales of finance receivables and loans originated as held-for-investment — — 4,156 — 4,156 Net change in loans — intercompany 61 — (2 ) (59 ) — Purchases of operating lease assets — — (1,472 ) — (1,472 ) Disposals of operating lease assets 9 — 3,038 — 3,047 Acquisitions of subsidiaries, net of cash acquired (288 ) — — — (288 ) Capital contributions to subsidiaries (988 ) — — 988 — Returns of contributed capital 1,971 8 — (1,979 ) — Net change in restricted cash 1 — 481 — 482 Net change in nonmarketable equity investments — — (354 ) — (354 ) Other, net (82 ) — 13 — (69 ) Net cash (used in) provided by investing activities (150 ) 8 (67 ) (1,050 ) (1,259 ) Financing activities Net change in short-term borrowings — third party 123 — (2,235 ) — (2,112 ) Net (decrease) increase in deposits (29 ) — 6,337 — 6,308 Proceeds from issuance of long-term debt — third party 1,115 — 7,905 — 9,020 Repayments of long-term debt — third party (596 ) — (13,709 ) — (14,305 ) Net change in debt — intercompany (8 ) — (62 ) 70 — Redemption of preferred stock (696 ) — — — (696 ) Dividends paid — third party (30 ) — — — (30 ) Dividends paid and returns of contributed capital — intercompany — (8 ) (2,600 ) 2,608 — Capital contributions from parent — — 988 (988 ) — Net cash used in financing activities (121 ) (8 ) (3,376 ) 1,690 (1,815 ) Effect of exchange-rate changes on cash and cash equivalents — — 3 — 3 Net decrease in cash and cash equivalents (139 ) — (521 ) 11 (649 ) Cash and cash equivalents at beginning of year 1,635 — 5,595 (850 ) 6,380 Cash and cash equivalents at June 30, $ 1,496 $ — $ 5,074 $ (839 ) $ 5,731 Six months ended June 30, 2015 ($ in millions) Parent Guarantors Nonguarantors Consolidating adjustments Ally consolidated Operating activities Net cash (used in) provided by operating activities $ (64 ) $ 525 $ 2,817 $ (1,535 ) $ 1,743 Investing activities Purchases of investment securities — — (8,165 ) — (8,165 ) Proceeds from sales of available-for-sale securities — — 2,865 — 2,865 Proceeds from maturities and repayments of available-for -sale securities — — 2,192 — 2,192 Net decrease (increase) in finance receivables and loans 787 — (6,258 ) — (5,471 ) Proceeds from sales of finance receivables and loans originated as held-for-investment — — 1,582 — 1,582 Net change in loans — intercompany 2,598 — 1,259 (3,857 ) — Purchases of operating lease assets — — (2,348 ) — (2,348 ) Disposals of operating lease assets — — 2,709 — 2,709 Capital contributions to subsidiaries (169 ) (1 ) 1 169 — Returns of contributed capital 602 — — (602 ) — Proceeds from sale of business unit, net 1,049 — — — 1,049 Net change in restricted cash — — 449 — 449 Net change in nonmarketable equity investments — — 88 — 88 Other, net (10 ) — (132 ) — (142 ) Net cash provided by (used in) investing activities 4,857 (1 ) (5,758 ) (4,290 ) (5,192 ) Financing activities Net change in short-term borrowings — third party 121 — 2,824 — 2,945 Net (decrease) increase in deposits (72 ) — 3,785 — 3,713 Proceeds from issuance of long-term debt — third party 3,780 — 14,038 — 17,818 Repayments of long-term debt — third party (5,837 ) — (13,147 ) — (18,984 ) Net change in debt — intercompany (1,131 ) — (2,597 ) 3,728 — Repurchase and redemption of preferred stock (442 ) — — — (442 ) Dividends paid — third party (1,318 ) — — — (1,318 ) Dividends paid and returns of contributed capital — intercompany — (525 ) (1,612 ) 2,137 — Capital contributions from parent — 1 168 (169 ) — Net cash (used in) provided by financing activities (4,899 ) (524 ) 3,459 5,696 3,732 Effect of exchange-rate changes on cash and cash equivalents — — (1 ) — (1 ) Net (decrease) increase in cash and cash equivalents (106 ) — 517 (129 ) 282 Cash and cash equivalents at beginning of year 2,286 — 3,905 (615 ) 5,576 Cash and cash equivalents at June 30, $ 2,180 $ — $ 4,422 $ (744 ) $ 5,858

Acquisition of Trade King Acq59

Acquisition of Trade King Acquisition of Trade King (Details) - USD ($)	Jun. 30, 2016	Jun. 01, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Business Acquisition Cash Paid		$ 298,000,000
Business Acquisition, Goodwill, Expected Tax Deductible Amount		0
Goodwill	$ 220,000,000		$ 27,000,000
Other Intangible Assets [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest		82,000,000
Cash and Cash Equivalents [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents		50,000,000
Other Assets [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest		14,000,000
Deferred Tax Asset [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest		4,000,000
Employee compensation and benefits [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents		40,000,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities		(41,000,000)
Other Liabilities [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities		(4,000,000)
Corporate and Other [Member]
Business Acquisition [Line Items]
Goodwill		$ 193,000,000	$ 0

Discontinued and Held-for-sal60

Discontinued and Held-for-sale Operations (Selected Income Statement Information for Discontinued Operations) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Automotive Finance Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sold Interest in Joint Venture		40.00%		40.00%
Equity Method Investment, Realized Gain (Loss) on Disposal				$ 400
Pretax income (loss) including direct costs to transact a sale	$ (1)	$ (5)	$ 0	453
Tax (benefit) expense - Discontinued Operations	0	0	0	65
Other Segments [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Pretax income (loss) including direct costs to transact a sale	(1)	18	2	20
Tax (benefit) expense - Discontinued Operations	$ (5)	$ 0	$ (4)	$ (2)

Other Income, Net Of Losses (Sc

Other Income, Net Of Losses (Schedule of Other Income, Net Of Losses) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Other Nonoperating Income (Expense) [Abstract]
Remarketing Fees	$ 25	$ 25	$ 53	$ 53
Fees and Commissions, Other	22	21	47	43
Servicing fees	18	10	31	20
Income (Loss) from Equity Method Investments	5	4	11	37
Other Income	26	24	49	38
Other income, net of losses	$ 96	$ 84	$ 191	$ 191

Other Operating Expenses (Sched

Other Operating Expenses (Schedule Of Other Operating Expenses) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Operating Expenses [Abstract]
Insurance Commissions	$ 97	$ 95	$ 191	$ 188
Communications and Information Technology	67	64	133	133
Lease And Loan Administration	34	32	66	61
Professional Fees	26	25	50	45
Marketing and Advertising Expense	21	23	48	54
Vehicle remarketing and repossession	22	18	46	37
Depreciation, Nonproduction	21	22	42	42
Regulatory and licensing fees	21	20	42	41
Occupancy, Net	12	13	25	24
Non-Income Taxes	8	7	17	15
Other Cost and Expense, Operating	57	47	111	110
Total other operating expenses	$ 386	$ 366	$ 771	$ 750

Investment Securities (Investme

Investment Securities (Investment Table) (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Schedule of Investments [Line Items]
Available-for-sale Securities, Amortized Cost Basis	$ 18,017	$ 17,350
Available-for-sale Securities, Gross Unrealized Gains	305	96
Available-for-sale Securities, Gross Unrealized Losses	(125)	(289)
Available-for-sale securities	18,197	17,157
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment	571	0
Total agency backed bonds	9,997	7,544
Deposit Assets	15	14
Financial Instruments Owned and Pledged as Collateral, Amount Eligible to be Repledged by Counterparty	492	745
Pledged Assets Separately Reported, Securities Pledged for Federal Home Loan Bank, at Fair Value	492	2,506
Cash Equivalents, at Carrying Value	900	1,000
Held-to-maturity Securities, Fair Value	579	0
Held-to-maturity Securities [Member]
Schedule of Investments [Line Items]
Unrealized Gain on Securities	9	0
Unrealized Gain (Loss) on Investments	(1)	0
Debt Securities [Member]
Schedule of Investments [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	17,342	16,542
Available-for-sale Debt Securities Gross Unrealized Gain	299	93
Available-for-sale Debt Securities, Gross Unrealized Loss	(43)	(195)
Available-for-sale Securities, Debt Securities	17,598	16,440
US Treasury and Government [Member]
Schedule of Investments [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	265	1,760
Available-for-sale Debt Securities Gross Unrealized Gain	10	0
Available-for-sale Debt Securities, Gross Unrealized Loss	0	(19)
Available-for-sale Securities, Debt Securities	275	1,741
US States and Political Subdivisions Debt Securities [Member]
Schedule of Investments [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	701	693
Available-for-sale Debt Securities Gross Unrealized Gain	33	24
Available-for-sale Debt Securities, Gross Unrealized Loss	(1)	(1)
Available-for-sale Securities, Debt Securities	733	716
Foreign Government Debt Securities [Member]
Schedule of Investments [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	180	169
Available-for-sale Debt Securities Gross Unrealized Gain	11	8
Available-for-sale Debt Securities, Gross Unrealized Loss	0	0
Available-for-sale Securities, Debt Securities	191	177
Residential Mortgage Backed Securities [Member]
Schedule of Investments [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	12,446	10,459
Available-for-sale Debt Securities Gross Unrealized Gain	199	52
Available-for-sale Debt Securities, Gross Unrealized Loss	(28)	(145)
Available-for-sale Securities, Debt Securities	12,617	10,366
Commercial Mortgage Backed Securities [Member]
Schedule of Investments [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	513	486
Available-for-sale Debt Securities Gross Unrealized Gain	1	0
Available-for-sale Debt Securities, Gross Unrealized Loss	(8)	(5)
Available-for-sale Securities, Debt Securities	506	481
Asset-backed Securities [Member]
Schedule of Investments [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	1,671	1,762
Available-for-sale Debt Securities Gross Unrealized Gain	6	1
Available-for-sale Debt Securities, Gross Unrealized Loss	(3)	(8)
Available-for-sale Securities, Debt Securities	1,674	1,755
Corporate Debt Securities [Member]
Schedule of Investments [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	1,566	1,213
Available-for-sale Debt Securities Gross Unrealized Gain	39	8
Available-for-sale Debt Securities, Gross Unrealized Loss	(3)	(17)
Available-for-sale Securities, Debt Securities	1,602	1,204
Equity Securities [Member]
Schedule of Investments [Line Items]
Available-for-sale Equity Securities, Amortized Cost Basis	675	808
Available-for-sale Equity Securities, Gross Unrealized Gain	6	3
Available-for-sale Equity Securities, Gross Unrealized Loss	(82)	(94)
Available-for-sale Securities, Equity Securities	$ 599	$ 717

Investment Securities (Invest64

Investment Securities (Investments Classified by Contractual Maturity Date) (Details) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Schedule of Investments [Line Items]
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment	$ 571	$ 0
Held-to-Maturity Debt Securities, Yield	2.90%
Held-to-maturity Securities, Debt Maturities, within One Year, Net Carrying Amount	$ 0
Held-to-Maturity Debt Securities, Due in One Year or Less, Yield	0.00%
Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Net Carrying Amount	$ 0
Held-to-Maturity Debt Securities, Due After One Year Through Five Years, Yield	0.00%
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount	$ 0
Held-to-Maturity Debt Securities, Due After Five Years Through Ten Years, Yield	0.00%
Held-to-maturity Securities, Debt Maturities, after Ten Years, Net Carrying Amount	$ 571
Held-to-Maturity Securities, Due After Ten Years, Yield	2.90%
Debt Securities [Member]
Schedule of Investments [Line Items]
Available-for-sale Securities, Debt Securities	$ 17,598	$ 16,440
Available-for-sale debt securities, Yield	2.90%	2.70%
Available-for-sale Debt Securities, Amortized Cost Basis	$ 17,342	$ 16,542
Available-for-sale debt securities, Due in one year or less, Amount	$ 211	$ 157
Available-for-sale debt securities, Due in one year or less, Yield	2.50%	2.00%
Amortized cost of available-for-sale debt securities, Due in one year or less, Amount	$ 211	$ 156
Available-for-sale debt securities, Due after one year through five years, Amount	$ 2,089	$ 2,397
Available-for-sale debt securities, Due after one year through five years, Yield	2.50%	2.10%
Amortized cost of available-for-sale debt securities, Due after one year through five years, Amount	$ 2,066	$ 2,404
Available-for-sale debt securities, Due after five years through ten years, Amount	$ 1,482	$ 2,424
Available-for-sale debt securities, Due after five years through ten years, Yield	3.00%	2.50%
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Amortized Cost Basis	$ 1,439	$ 2,436
Available-for-sale debt securities, Due after ten years, Amount	$ 13,816	$ 11,462
Available-for-sale debt securities, Due after ten years, Yield	2.90%	2.90%
Amortized cost of available-for-sale debt securities, Due after ten years, Amount	$ 13,626	$ 11,546
US Treasury and Government [Member]
Schedule of Investments [Line Items]
Available-for-sale Securities, Debt Securities	$ 275	$ 1,741
Available-for-sale debt securities, Yield	1.80%	1.80%
Available-for-sale Debt Securities, Amortized Cost Basis	$ 265	$ 1,760
Available-for-sale debt securities, Due in one year or less, Amount	$ 2	$ 6
Available-for-sale debt securities, Due in one year or less, Yield	4.20%	5.10%
Available-for-sale debt securities, Due after one year through five years, Amount	$ 61	$ 510
Available-for-sale debt securities, Due after one year through five years, Yield	1.50%	1.20%
Available-for-sale debt securities, Due after five years through ten years, Amount	$ 212	$ 1,225
Available-for-sale debt securities, Due after five years through ten years, Yield	1.90%	2.10%
Available-for-sale debt securities, Due after ten years, Amount	$ 0	$ 0
Available-for-sale debt securities, Due after ten years, Yield	0.00%	0.00%
US States and Political Subdivisions Debt Securities [Member]
Schedule of Investments [Line Items]
Available-for-sale Securities, Debt Securities	$ 733	$ 716
Available-for-sale debt securities, Yield	3.10%	3.20%
Available-for-sale Debt Securities, Amortized Cost Basis	$ 701	$ 693
Available-for-sale debt securities, Due in one year or less, Amount	$ 127	$ 86
Available-for-sale debt securities, Due in one year or less, Yield	2.40%	1.30%
Available-for-sale debt securities, Due after one year through five years, Amount	$ 31	$ 37
Available-for-sale debt securities, Due after one year through five years, Yield	1.90%	2.20%
Available-for-sale debt securities, Due after five years through ten years, Amount	$ 123	$ 141
Available-for-sale debt securities, Due after five years through ten years, Yield	3.00%	2.80%
Available-for-sale debt securities, Due after ten years, Amount	$ 452	$ 452
Available-for-sale debt securities, Due after ten years, Yield	3.40%	3.70%
Foreign Government Debt Securities [Member]
Schedule of Investments [Line Items]
Available-for-sale Securities, Debt Securities	$ 191	$ 177
Available-for-sale debt securities, Yield	2.70%	2.60%
Available-for-sale Debt Securities, Amortized Cost Basis	$ 180	$ 169
Available-for-sale debt securities, Due in one year or less, Amount	$ 9	$ 9
Available-for-sale debt securities, Due in one year or less, Yield	2.50%	1.90%
Available-for-sale debt securities, Due after one year through five years, Amount	$ 85	$ 77
Available-for-sale debt securities, Due after one year through five years, Yield	2.90%	2.80%
Available-for-sale debt securities, Due after five years through ten years, Amount	$ 97	$ 91
Available-for-sale debt securities, Due after five years through ten years, Yield	2.50%	2.60%
Available-for-sale debt securities, Due after ten years, Amount	$ 0	$ 0
Available-for-sale debt securities, Due after ten years, Yield	0.00%	0.00%
Residential Mortgage Backed Securities [Member]
Schedule of Investments [Line Items]
Available-for-sale Securities, Debt Securities	$ 12,617	$ 10,366
Available-for-sale debt securities, Yield	2.90%	2.90%
Available-for-sale Debt Securities, Amortized Cost Basis	$ 12,446	$ 10,459
Available-for-sale debt securities, Due in one year or less, Amount	$ 0	$ 0
Available-for-sale debt securities, Due in one year or less, Yield	0.00%	0.00%
Available-for-sale debt securities, Due after one year through five years, Amount	$ 1	$ 33
Available-for-sale debt securities, Due after one year through five years, Yield	4.50%	2.10%
Available-for-sale debt securities, Due after five years through ten years, Amount	$ 28	$ 36
Available-for-sale debt securities, Due after five years through ten years, Yield	2.50%	2.50%
Available-for-sale debt securities, Due after ten years, Amount	$ 12,588	$ 10,297
Available-for-sale debt securities, Due after ten years, Yield	2.90%	2.90%
Commercial Mortgage Backed Securities [Member]
Schedule of Investments [Line Items]
Available-for-sale Securities, Debt Securities	$ 506	$ 481
Available-for-sale debt securities, Yield	2.30%	2.00%
Available-for-sale Debt Securities, Amortized Cost Basis	$ 513	$ 486
Available-for-sale debt securities, Due in one year or less, Amount	$ 0	$ 0
Available-for-sale debt securities, Due in one year or less, Yield	0.00%	0.00%
Available-for-sale debt securities, Due after one year through five years, Amount	$ 0	$ 0
Available-for-sale debt securities, Due after one year through five years, Yield	0.00%	0.00%
Available-for-sale debt securities, Due after five years through ten years, Amount	$ 3	$ 3
Available-for-sale debt securities, Due after five years through ten years, Yield	2.80%	2.70%
Available-for-sale debt securities, Due after ten years, Amount	$ 503	$ 478
Available-for-sale debt securities, Due after ten years, Yield	2.30%	2.00%
Asset-backed Securities [Member]
Schedule of Investments [Line Items]
Available-for-sale Securities, Debt Securities	$ 1,674	$ 1,755
Available-for-sale debt securities, Yield	2.70%	2.30%
Available-for-sale Debt Securities, Amortized Cost Basis	$ 1,671	$ 1,762
Available-for-sale debt securities, Due in one year or less, Amount	$ 0	$ 6
Available-for-sale debt securities, Due in one year or less, Yield	0.00%	1.40%
Available-for-sale debt securities, Due after one year through five years, Amount	$ 992	$ 1,027
Available-for-sale debt securities, Due after one year through five years, Yield	2.50%	2.10%
Available-for-sale debt securities, Due after five years through ten years, Amount	$ 444	$ 518
Available-for-sale debt securities, Due after five years through ten years, Yield	3.20%	2.60%
Available-for-sale debt securities, Due after ten years, Amount	$ 238	$ 204
Available-for-sale debt securities, Due after ten years, Yield	2.40%	2.20%
Corporate Debt Securities [Member]
Schedule of Investments [Line Items]
Available-for-sale Securities, Debt Securities	$ 1,602	$ 1,204
Available-for-sale debt securities, Yield	2.90%	2.90%
Available-for-sale Debt Securities, Amortized Cost Basis	$ 1,566	$ 1,213
Available-for-sale debt securities, Due in one year or less, Amount	$ 73	$ 50
Available-for-sale debt securities, Due in one year or less, Yield	2.70%	3.00%
Available-for-sale debt securities, Due after one year through five years, Amount	$ 919	$ 713
Available-for-sale debt securities, Due after one year through five years, Yield	2.60%	2.50%
Available-for-sale debt securities, Due after five years through ten years, Amount	$ 575	$ 410
Available-for-sale debt securities, Due after five years through ten years, Yield	3.30%	3.40%
Available-for-sale debt securities, Due after ten years, Amount	$ 35	$ 31
Available-for-sale debt securities, Due after ten years, Yield	5.10%	5.40%

Investment Securities (Invest65

Investment Securities (Investment Income) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Investments, Debt and Equity Securities [Abstract]
Taxable interest	$ 89	$ 82	$ 183	$ 162
Taxable dividends	5	6	9	11
Interest and dividends exempt from U.S. federal income tax	5	5	9	8
Interest and dividends on available-for-sale investment securities	$ 99	$ 93	$ 201	$ 181

Investment Securities (Schedule

Investment Securities (Schedule Of Realized Gain (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Available-for-sale Securities [Abstract]
Available-for-sale Securities, Gross Realized Gains	$ 40	$ 46	$ 94	$ 106
Available-for-sale Securities, Gross Realized Losses	(1)	0	(1)	(3)
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Available-for-sale Securities	0	(1)	0	(3)
Available-for-sale Securities, Gross Realized Gain (Loss)	$ 39	$ 45	$ 93	$ 100

Investment Securities (Schedu67

Investment Securities (Schedule of Unrealized Loss on Investments) (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Fair value Less than 12 months	$ 1,842	$ 8,511
Available-for-sale Securities, Unrealized Loss Less than 12 months	(47)	(139)
Available-for-sale Securities, Fair value 12 months or longer	2,563	2,798
Available-for-sale Securities, Unrealized Loss 12 months or longer	(78)	(150)
Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Fair value Less than 12 months	1,574	7,977
Available-for-sale Securities, Unrealized Loss Less than 12 months	(10)	(85)
Available-for-sale Securities, Fair value 12 months or longer	2,356	2,702
Available-for-sale Securities, Unrealized Loss 12 months or longer	(33)	(110)
US Treasury and Government [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Fair value Less than 12 months	0	1,553
Available-for-sale Securities, Unrealized Loss Less than 12 months	0	(17)
Available-for-sale Securities, Fair value 12 months or longer	0	173
Available-for-sale Securities, Unrealized Loss 12 months or longer	0	(2)
US States and Political Subdivisions Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Fair value Less than 12 months	169	179
Available-for-sale Securities, Unrealized Loss Less than 12 months	(1)	(1)
Available-for-sale Securities, Fair value 12 months or longer	10	0
Available-for-sale Securities, Unrealized Loss 12 months or longer	0	0
Foreign Government Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Fair value Less than 12 months	0	2
Available-for-sale Securities, Unrealized Loss Less than 12 months	0	0
Available-for-sale Securities, Fair value 12 months or longer	0	0
Available-for-sale Securities, Unrealized Loss 12 months or longer	0	0
Residential Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Fair value Less than 12 months	676	4,096
Available-for-sale Securities, Unrealized Loss Less than 12 months	(6)	(43)
Available-for-sale Securities, Fair value 12 months or longer	2,139	2,453
Available-for-sale Securities, Unrealized Loss 12 months or longer	(30)	(107)
Asset-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Fair value Less than 12 months	656	1,402
Available-for-sale Securities, Unrealized Loss Less than 12 months	(2)	(8)
Available-for-sale Securities, Fair value 12 months or longer	144	64
Available-for-sale Securities, Unrealized Loss 12 months or longer	(1)	0
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Fair value Less than 12 months	73	745
Available-for-sale Securities, Unrealized Loss Less than 12 months	(1)	(16)
Available-for-sale Securities, Fair value 12 months or longer	63	12
Available-for-sale Securities, Unrealized Loss 12 months or longer	(2)	(1)
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Fair value Less than 12 months	268	534
Available-for-sale Securities, Unrealized Loss Less than 12 months	(37)	(54)
Available-for-sale Securities, Fair value 12 months or longer	207	96
Available-for-sale Securities, Unrealized Loss 12 months or longer	$ (45)	$ (40)

Finance Receivables And Loans68

Finance Receivables And Loans, Net (Schedule of Accounts, Notes, Loans and Financing Receivables) (Details) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Derivative, Amount of Hedged Item	$ 537	$ 331
Finance receivables and loans, net	112,653	111,600	$ 105,172
Loans and Finance Receivables [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums	268	110
Fair Value Option Election, Fair Value [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables and loans, net		111,600
Consumer Portfolio Segment [Member] | Consumer Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables and loans, net	74,365	74,065
Consumer Portfolio Segment [Member] | Automobile Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables and loans, net	63,281	64,292	60,786
Consumer Portfolio Segment [Member] | Automobile Loan [Member] | Designated as Hedging Instrument [Member] | Interest Rate Contract [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Derivative, Amount of Hedged Item	88	66
Consumer Portfolio Segment [Member] | Residential Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables and loans, net	11,084	9,773	9,211
Consumer Portfolio Segment [Member] | Mortgage Finance [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables and loans, net	8,009	6,413
Held For Investment Mortgage Finance Receivables Interest Only Mortgage Loans	$ 38	44
Consumer Portfolio Segment [Member] | Mortgage Finance [Member] | Six months or less [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest-only mortgage loan portfolio principal amortization	5.00%
Consumer Portfolio Segment [Member] | Mortgage Finance [Member] | One year six months, or less [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest-only mortgage loan portfolio principal amortization	2.00%
Consumer Portfolio Segment [Member] | Mortgage Finance [Member] | Two years six months, or less [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest-only mortgage loan portfolio principal amortization	0.00%
Consumer Portfolio Segment [Member] | Mortgage Finance [Member] | Three years six months, or less [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest-only mortgage loan portfolio principal amortization	38.00%
Consumer Portfolio Segment [Member] | Mortgage Finance [Member] | Four years six months, or greater [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest-only mortgage loan portfolio principal amortization	38.00%
Consumer Portfolio Segment [Member] | Mortgage - Legacy [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables and loans, net	$ 3,075	3,360
Held For Investment Mortgage Finance Receivables Interest Only Mortgage Loans	$ 830	941
Consumer Portfolio Segment [Member] | Mortgage - Legacy [Member] | Six months or less [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest-only mortgage loan portfolio principal amortization	22.00%
Consumer Portfolio Segment [Member] | Mortgage - Legacy [Member] | One year six months, or less [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest-only mortgage loan portfolio principal amortization	22.00%
Consumer Portfolio Segment [Member] | Mortgage - Legacy [Member] | Two years six months, or less [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest-only mortgage loan portfolio principal amortization	2.00%
Consumer Portfolio Segment [Member] | Mortgage - Legacy [Member] | Three years six months, or less [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest-only mortgage loan portfolio principal amortization	0.00%
Consumer Portfolio Segment [Member] | Mortgage - Legacy [Member] | Four years six months, or greater [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest-only mortgage loan portfolio principal amortization	1.00%
Commercial Portfolio Segment [Member] | Commercial Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables and loans, net	$ 38,288	37,535	$ 35,175
Commercial Portfolio Segment [Member] | Commercial And Industrial Automobile [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables and loans, net	31,640	31,469
Commercial Portfolio Segment [Member] | Commercial And Industrial Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables and loans, net	3,037	2,640
Commercial Portfolio Segment [Member] | Commercial Real Estate Automobile [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables and loans, net	$ 3,611	$ 3,426

Finance Receivables And Loans69

Finance Receivables And Loans, Net (Allowance For Credit Losses On Financing Receivables) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Financing Receivable, Allowance for Loan and Lease Losses [Roll Forward]
Loans and Leases Receivable, Allowance, Beginning Balance	$ 1,077	$ 933	$ 1,054	$ 977
Allowance for Loan and Lease Losses, Write-offs	(237)	(175)	(500)	(390)
Allowance for Loan and Lease Loss, Recovery of Bad Debts	85	75	169	140
Allowance for Loan and Lease Losses Write-offs, Net	(152)	(100)	(331)	(250)
Allowance for Loan and Lease Losses, Provision for Loss, Net	172	140	392	256
Allowance for Loan and Lease Losses, Adjustments, Net	(8)	1	(26)	(9)
Loans and Leases Receivable, Allowance, Ending Balance	1,089	974	1,089	974
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	86	91	86	91
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	1,003	883	1,003	883
Finance receivables and loans, net	112,653	105,172	112,653	105,172	$ 111,600
Financing Receivable, Individually Evaluated for Impairment	724	639	724	639
Financing Receivable, Collectively Evaluated for Impairment	111,929	104,533	111,929	104,533
Receivables Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Financing Receivable, Allowance for Credit Losses	0	0	0	0
Finance receivables and loans, net	0	0	0	0
Consumer Portfolio Segment [Member] | Automobile Loan [Member]
Financing Receivable, Allowance for Loan and Lease Losses [Roll Forward]
Loans and Leases Receivable, Allowance, Beginning Balance	850	711	834	685
Allowance for Loan and Lease Losses, Write-offs	(227)	(166)	(480)	(359)
Allowance for Loan and Lease Loss, Recovery of Bad Debts	79	70	159	131
Allowance for Loan and Lease Losses Write-offs, Net	(148)	(96)	(321)	(228)
Allowance for Loan and Lease Losses, Provision for Loss, Net	168	152	375	310
Allowance for Loan and Lease Losses, Adjustments, Net	(8)	0	(26)	0
Loans and Leases Receivable, Allowance, Ending Balance	862	767	862	767
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	26	22	26	22
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	836	745	836	745
Finance receivables and loans, net	63,281	60,786	63,281	60,786	64,292
Financing Receivable, Individually Evaluated for Impairment	348	275	348	275
Financing Receivable, Collectively Evaluated for Impairment	62,933	60,511	62,933	60,511
Consumer Portfolio Segment [Member] | Automobile Loan [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Financing Receivable, Allowance for Credit Losses	0	0	0	0
Finance receivables and loans, net	0	0	0	0
Consumer Portfolio Segment [Member] | Residential Mortgage [Member]
Financing Receivable, Allowance for Loan and Lease Losses [Roll Forward]
Loans and Leases Receivable, Allowance, Beginning Balance	115	119	114	152
Allowance for Loan and Lease Losses, Write-offs	(9)	(9)	(19)	(31)
Allowance for Loan and Lease Loss, Recovery of Bad Debts	5	5	9	8
Allowance for Loan and Lease Losses Write-offs, Net	(4)	(4)	(10)	(23)
Allowance for Loan and Lease Losses, Provision for Loss, Net	(2)	3	5	(2)
Allowance for Loan and Lease Losses, Adjustments, Net	0	1	0	(8)
Loans and Leases Receivable, Allowance, Ending Balance	109	119	109	119
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	37	50	37	50
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	72	69	72	69
Finance receivables and loans, net	11,084	9,211	11,084	9,211	9,773
Financing Receivable, Individually Evaluated for Impairment	254	265	254	265
Financing Receivable, Collectively Evaluated for Impairment	10,830	8,946	10,830	8,946
Consumer Portfolio Segment [Member] | Residential Mortgage [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Financing Receivable, Allowance for Credit Losses	0	0	0	0
Finance receivables and loans, net	0	0	0	0
Commercial Portfolio Segment [Member] | Commercial Loan [Member]
Financing Receivable, Allowance for Loan and Lease Losses [Roll Forward]
Loans and Leases Receivable, Allowance, Beginning Balance	112	103	106	140
Allowance for Loan and Lease Losses, Write-offs	(1)	0	(1)	0
Allowance for Loan and Lease Loss, Recovery of Bad Debts	1	0	1	1
Allowance for Loan and Lease Losses Write-offs, Net	0	0	0	1
Allowance for Loan and Lease Losses, Provision for Loss, Net	6	(15)	12	(52)
Allowance for Loan and Lease Losses, Adjustments, Net	0	0	0	(1)
Loans and Leases Receivable, Allowance, Ending Balance	118	88	118	88
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	23	19	23	19
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	95	69	95	69
Finance receivables and loans, net	38,288	35,175	38,288	35,175	$ 37,535
Financing Receivable, Individually Evaluated for Impairment	122	99	122	99
Financing Receivable, Collectively Evaluated for Impairment	38,166	35,076	38,166	35,076
Commercial Portfolio Segment [Member] | Commercial Loan [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Financing Receivable, Allowance for Credit Losses	0	0	0	0
Finance receivables and loans, net	$ 0	$ 0	$ 0	$ 0

Finance Receivables And Loans70

Finance Receivables And Loans, Net (Schedule Of Sales Of Financing Receivables And Loans) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Significant Sales and Transfers	$ 1,592	$ 4	$ 4,193	$ 73
Consumer Portfolio Segment [Member] | Automobile Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Significant Sales and Transfers	1,560	0	4,159	0
Consumer Portfolio Segment [Member] | Residential Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Significant Sales and Transfers	4	4	6	73
Commercial Portfolio Segment [Member] | Commercial Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Significant Sales and Transfers	$ 28	$ 0	$ 28	$ 0

Finance Receivables And Loans71

Finance Receivables And Loans, Net Finance Receivables And Loans, Net (Schedule of Purchases of Financing Receivables and Loans) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Significant Purchases	$ 1,018	$ 1,996	$ 2,388	$ 2,650
Consumer Portfolio Segment [Member] | Automobile Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Significant Purchases	0	0	0	0
Consumer Portfolio Segment [Member] | Residential Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Significant Purchases	$ 1,018	$ 1,996	$ 2,388	$ 2,650

Finance Receivables And Loans72

Finance Receivables And Loans, Net (Past Due Financing Receivables And Loans) (Details) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	$ 2,154	$ 2,414
Current	110,499	109,186
Finance receivables and loans, net	112,653	111,600	$ 105,172
Consumer Portfolio Segment [Member] | Consumer Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	2,154	2,414
Current	72,211	71,651
Finance receivables and loans, net	74,365	74,065
Consumer Portfolio Segment [Member] | Automobile Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	1,971	2,209
Current	61,310	62,083
Finance receivables and loans, net	63,281	64,292	60,786
Consumer Portfolio Segment [Member] | Residential Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	183	205
Current	10,901	9,568
Finance receivables and loans, net	11,084	9,773	9,211
Consumer Portfolio Segment [Member] | Mortgage Finance [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	62	59
Current	7,947	6,354
Finance receivables and loans, net	8,009	6,413
Consumer Portfolio Segment [Member] | Mortgage - Legacy [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	121	146
Current	2,954	3,214
Finance receivables and loans, net	3,075	3,360
Commercial Portfolio Segment [Member] | Commercial Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0	0
Current	38,288	37,535
Finance receivables and loans, net	38,288	37,535	$ 35,175
Commercial Portfolio Segment [Member] | Commercial And Industrial Automobile [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0	0
Current	31,640	31,469
Finance receivables and loans, net	31,640	31,469
Commercial Portfolio Segment [Member] | Commercial And Industrial Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0	0
Current	3,037	2,640
Finance receivables and loans, net	3,037	2,640
Commercial Portfolio Segment [Member] | Commercial Real Estate Automobile [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0	0
Current	3,611	3,426
Finance receivables and loans, net	3,611	3,426
Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	1,534	1,715
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Consumer Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	1,534	1,715
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Automobile Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	1,438	1,618
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Residential Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	96	97
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Mortgage Finance [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	49	44
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Mortgage - Legacy [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	47	53
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Commercial Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0	0
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Commercial And Industrial Automobile [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0	0
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Commercial And Industrial Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0	0
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Commercial Real Estate Automobile [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0	0
Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	324	394
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Consumer Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	324	394
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Automobile Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	307	369
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Residential Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	17	25
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Mortgage Finance [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	5	5
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Mortgage - Legacy [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	12	20
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Commercial Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Commercial And Industrial Automobile [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Commercial And Industrial Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Commercial Real Estate Automobile [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	296	305
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Consumer Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	296	305
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Automobile Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	226	222
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Residential Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	70	83
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Mortgage Finance [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	8	10
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Mortgage - Legacy [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	62	73
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Commercial Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Commercial And Industrial Automobile [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Commercial And Industrial Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Commercial Real Estate Automobile [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	$ 0	$ 0

Finance Receivables And Loans73

Finance Receivables And Loans, Net (Schedule of Financing Receivables, Non Accrual Status) (Details) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables and loans, net	$ 112,653	$ 111,600	$ 105,172
Finance receivables and loans on nonaccrual status	734	680
Consumer Portfolio Segment [Member] | Consumer Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables and loans, net	74,365	74,065
Finance receivables and loans on nonaccrual status	612	603
Consumer Portfolio Segment [Member] | Automobile Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables and loans, net	63,281	64,292	60,786
Finance receivables and loans on nonaccrual status	505	475
Consumer Portfolio Segment [Member] | Residential Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables and loans, net	11,084	9,773	9,211
Finance receivables and loans on nonaccrual status	107	128
Consumer Portfolio Segment [Member] | Mortgage Finance [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables and loans, net	8,009	6,413
Finance receivables and loans on nonaccrual status	12	15
Consumer Portfolio Segment [Member] | Mortgage - Legacy [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables and loans, net	3,075	3,360
Finance receivables and loans on nonaccrual status	95	113
Commercial Portfolio Segment [Member] | Commercial Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables and loans, net	38,288	37,535	$ 35,175
Finance receivables and loans on nonaccrual status	122	77
Commercial Portfolio Segment [Member] | Commercial And Industrial Automobile [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables and loans, net	31,640	31,469
Finance receivables and loans on nonaccrual status	51	25
Commercial Portfolio Segment [Member] | Commercial And Industrial Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables and loans, net	3,037	2,640
Finance receivables and loans on nonaccrual status	64	44
Commercial Portfolio Segment [Member] | Commercial Real Estate Automobile [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables and loans, net	3,611	3,426
Finance receivables and loans on nonaccrual status	$ 7	$ 8

Finance Receivables And Loans74

Finance Receivables And Loans, Net (Financing Receivable Credit Quality Indicators - Performing and Nonperforming) (Details) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015
Financing Receivable, Recorded Investment [Line Items]
Finance receivables and loans, net	$ 112,653	$ 111,600	$ 105,172
Consumer Portfolio Segment [Member] | Consumer Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Finance receivables and loans, net	74,365	74,065
Consumer Portfolio Segment [Member] | Consumer Loan [Member] | Performing Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Finance receivables and loans, net	73,753	73,462
Consumer Portfolio Segment [Member] | Consumer Loan [Member] | Nonperforming Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Finance receivables and loans, net	612	603
Consumer Portfolio Segment [Member] | Automobile Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Finance receivables and loans, net	63,281	64,292	60,786
Consumer Portfolio Segment [Member] | Automobile Loan [Member] | Performing Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Finance receivables and loans, net	62,776	63,817
Consumer Portfolio Segment [Member] | Automobile Loan [Member] | Nonperforming Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Finance receivables and loans, net	505	475
Consumer Portfolio Segment [Member] | Residential Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Finance receivables and loans, net	11,084	9,773	$ 9,211
Consumer Portfolio Segment [Member] | Residential Mortgage [Member] | Performing Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Finance receivables and loans, net	10,977	9,645
Consumer Portfolio Segment [Member] | Residential Mortgage [Member] | Nonperforming Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Finance receivables and loans, net	107	128
Consumer Portfolio Segment [Member] | Mortgage Finance [Member]
Financing Receivable, Recorded Investment [Line Items]
Finance receivables and loans, net	8,009	6,413
Consumer Portfolio Segment [Member] | Mortgage Finance [Member] | Performing Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Finance receivables and loans, net	7,997	6,398
Consumer Portfolio Segment [Member] | Mortgage Finance [Member] | Nonperforming Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Finance receivables and loans, net	12	15
Consumer Portfolio Segment [Member] | Mortgage - Legacy [Member]
Financing Receivable, Recorded Investment [Line Items]
Finance receivables and loans, net	3,075	3,360
Consumer Portfolio Segment [Member] | Mortgage - Legacy [Member] | Performing Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Finance receivables and loans, net	2,980	3,247
Consumer Portfolio Segment [Member] | Mortgage - Legacy [Member] | Nonperforming Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Finance receivables and loans, net	$ 95	$ 113

Finance Receivables And Loans75

Finance Receivables And Loans, Net (Schedule Of Pass And Criticized Credit Quality Indicators Of Finance Receivables) (Details) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015
Financing Receivable, Recorded Investment [Line Items]
Finance receivables and loans, net	$ 112,653	$ 111,600	$ 105,172
Commercial Portfolio Segment [Member] | Commercial Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Finance receivables and loans, net	38,288	37,535	$ 35,175
Commercial Portfolio Segment [Member] | Commercial Loan [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Finance receivables and loans, net	35,437	35,000
Commercial Portfolio Segment [Member] | Commercial Loan [Member] | Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Finance receivables and loans, net	2,851	2,535
Commercial Portfolio Segment [Member] | Commercial And Industrial Automobile [Member]
Financing Receivable, Recorded Investment [Line Items]
Finance receivables and loans, net	31,640	31,469
Commercial Portfolio Segment [Member] | Commercial And Industrial Automobile [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Finance receivables and loans, net	29,638	29,613
Commercial Portfolio Segment [Member] | Commercial And Industrial Automobile [Member] | Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Finance receivables and loans, net	2,002	1,856
Commercial Portfolio Segment [Member] | Commercial And Industrial Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Finance receivables and loans, net	3,037	2,640
Commercial Portfolio Segment [Member] | Commercial And Industrial Other [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Finance receivables and loans, net	2,354	2,122
Commercial Portfolio Segment [Member] | Commercial And Industrial Other [Member] | Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Finance receivables and loans, net	683	518
Commercial Portfolio Segment [Member] | Commercial Real Estate Automobile [Member]
Financing Receivable, Recorded Investment [Line Items]
Finance receivables and loans, net	3,611	3,426
Commercial Portfolio Segment [Member] | Commercial Real Estate Automobile [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Finance receivables and loans, net	3,445	3,265
Commercial Portfolio Segment [Member] | Commercial Real Estate Automobile [Member] | Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Finance receivables and loans, net	$ 166	$ 161

Finance Receivables And Loans76

Finance Receivables And Loans, Net (Impaired Financing Receivables) (Details) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	$ 771	$ 661
Carrying value before allowance	724	658
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	190	69
Impaired Financing Receivable, with Related Allowance, Recorded Investment	534	589
Impaired Financing Receivable, Related Allowance	86	86
Consumer Portfolio Segment [Member] | Consumer Loan [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	636	584
Carrying value before allowance	602	581
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	180	64
Impaired Financing Receivable, with Related Allowance, Recorded Investment	422	517
Impaired Financing Receivable, Related Allowance	63	66
Consumer Portfolio Segment [Member] | Automobile Loan [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	378	315
Carrying value before allowance	348	315
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	121	0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	227	315
Impaired Financing Receivable, Related Allowance	26	22
Consumer Portfolio Segment [Member] | Residential Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	258	269
Carrying value before allowance	254	266
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	59	64
Impaired Financing Receivable, with Related Allowance, Recorded Investment	195	202
Impaired Financing Receivable, Related Allowance	37	44
Consumer Portfolio Segment [Member] | Mortgage Finance [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	8	9
Carrying value before allowance	8	9
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	3	5
Impaired Financing Receivable, with Related Allowance, Recorded Investment	5	4
Impaired Financing Receivable, Related Allowance	0	1
Consumer Portfolio Segment [Member] | Mortgage - Legacy [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	250	260
Carrying value before allowance	246	257
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	56	59
Impaired Financing Receivable, with Related Allowance, Recorded Investment	190	198
Impaired Financing Receivable, Related Allowance	37	43
Commercial Portfolio Segment [Member] | Commercial Loan [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	135	77
Carrying value before allowance	122	77
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	10	5
Impaired Financing Receivable, with Related Allowance, Recorded Investment	112	72
Impaired Financing Receivable, Related Allowance	23	20
Commercial Portfolio Segment [Member] | Commercial And Industrial Automobile [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	51	25
Carrying value before allowance	51	25
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	9	4
Impaired Financing Receivable, with Related Allowance, Recorded Investment	42	21
Impaired Financing Receivable, Related Allowance	3	3
Commercial Portfolio Segment [Member] | Commercial And Industrial Other [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	77	44
Carrying value before allowance	64	44
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0	0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	64	44
Impaired Financing Receivable, Related Allowance	17	15
Commercial Portfolio Segment [Member] | Commercial Real Estate Automobile [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	7	8
Carrying value before allowance	7	8
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	1	1
Impaired Financing Receivable, with Related Allowance, Recorded Investment	6	7
Impaired Financing Receivable, Related Allowance	$ 3	$ 2

Finance Receivables And Loans77

Finance Receivables And Loans, Net (Schedule of Average Balance And Interest Income Of Impaired Finance Receivables) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	$ 706	$ 621	$ 691	$ 656
Impaired Financing Receivable, Interest Income, Accrual Method	7	8	14	17
Consumer Portfolio Segment [Member] | Consumer Loan [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	600	544	596	576
Impaired Financing Receivable, Interest Income, Accrual Method	7	7	13	13
Consumer Portfolio Segment [Member] | Automobile Loan [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	341	285	335	287
Impaired Financing Receivable, Interest Income, Accrual Method	4	5	8	9
Consumer Portfolio Segment [Member] | Residential Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	259	259	261	289
Impaired Financing Receivable, Interest Income, Accrual Method	3	2	5	4
Consumer Portfolio Segment [Member] | Mortgage Finance [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	8	7	8	7
Impaired Financing Receivable, Interest Income, Accrual Method	0	0	0	0
Consumer Portfolio Segment [Member] | Mortgage - Legacy [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	251	252	253	282
Impaired Financing Receivable, Interest Income, Accrual Method	3	2	5	4
Commercial Portfolio Segment [Member] | Commercial Loan [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	106	77	95	80
Impaired Financing Receivable, Interest Income, Accrual Method	0	1	1	4
Commercial Portfolio Segment [Member] | Commercial And Industrial Automobile [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	35	41	32	38
Impaired Financing Receivable, Interest Income, Accrual Method	0	1	0	1
Commercial Portfolio Segment [Member] | Commercial And Industrial Other [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	65	31	56	37
Impaired Financing Receivable, Interest Income, Accrual Method	0	0	1	3
Commercial Portfolio Segment [Member] | Commercial Real Estate Automobile [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	6	5	7	5
Impaired Financing Receivable, Interest Income, Accrual Method	$ 0	$ 0	$ 0	$ 0

Finance Receivables and Loans78

Finance Receivables and Loans, Net (Troubled Debt Restructurings) (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016USD ($)	Jun. 30, 2015USD ($)	Jun. 30, 2016USD ($)	Jun. 30, 2015USD ($)	Dec. 31, 2015USD ($)
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	$ 644		$ 644		$ 625
Financing Receivable, Modifications, Number of Contracts	4,795	4,172	10,449	8,267
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 84	$ 86	$ 178	$ 156
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 73	$ 75	$ 154	$ 134
Consumer Portfolio Segment [Member] | Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	4,795	4,172	10,449	8,267
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 84	$ 86	$ 178	$ 156
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 73	$ 75	$ 154	$ 134
Consumer Portfolio Segment [Member] | Automobile Loan [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	4,767	4,096	10,389	8,151
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 79	$ 64	$ 168	$ 127
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 68	$ 54	$ 144	$ 107
Consumer Portfolio Segment [Member] | Residential Mortgage [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	28	76	60	116
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 5	$ 22	$ 10	$ 29
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 5	$ 21	$ 10	$ 27
Consumer Portfolio Segment [Member] | Mortgage Finance [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	2	0	3	2
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 1	$ 0	$ 2	$ 1
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 1	$ 0	$ 2	$ 1
Consumer Portfolio Segment [Member] | Mortgage - Legacy [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	26	76	57	114
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 4	$ 22	$ 8	$ 28
Financing Receivable, Modifications, Post-Modification Recorded Investment	4	$ 21	8	$ 26
Commercial Portfolio Segment [Member] | Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Impaired, Commitment to Lend	$ 2		$ 2		$ 2
Financing Receivable, Modifications, Number of Contracts	0	0	0	0
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 0	$ 0	$ 0	$ 0
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 0	$ 0	$ 0	$ 0
Commercial Portfolio Segment [Member] | Commercial And Industrial Automobile [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	0	0	0	0
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 0	$ 0	$ 0	$ 0
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 0	$ 0	$ 0	$ 0
Commercial Portfolio Segment [Member] | Commercial And Industrial Other [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	0	0	0	0
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 0	$ 0	$ 0	$ 0
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 0	$ 0	$ 0	$ 0
Commercial Portfolio Segment [Member] | Commercial Real Estate Automobile [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	0	0	0	0
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 0	$ 0	$ 0	$ 0
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 0	$ 0	$ 0	$ 0

Finance Receivables And Loans79

Finance Receivables And Loans, Net (Redefaults) (Details) - Consumer Portfolio Segment [Member] $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016USD ($)	Jun. 30, 2015USD ($)	Jun. 30, 2016USD ($)	Jun. 30, 2015USD ($)
Consumer Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	1,860	1,502	3,661	3,087
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 23	$ 18	$ 46	$ 37
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	$ 13	$ 10	$ 25	$ 21
Automobile Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	1,858	1,499	3,658	3,080
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 23	$ 18	$ 46	$ 37
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	$ 13	$ 10	$ 25	$ 21
Mortgage Finance [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0	$ 0	$ 0
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	$ 0	$ 0	$ 0	$ 0
Mortgage - Legacy [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	2	3	3	7
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0	$ 0	$ 0
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	$ 0	$ 0	$ 0	$ 0

Investment In Operating Lease80

Investment In Operating Leases, Net (Investments In Operating Leases) (Details) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Leases, Operating [Abstract]
Property Subject to or Available for Operating Lease, Gross	$ 17,418	$ 20,211
Property Subject to or Available for Operating Lease, Accumulated Depreciation	(3,663)	(3,940)
Property Subject to or Available for Operating Lease, Net	$ 13,755	$ 16,271

Investment In Operating Lease81

Investment In Operating Leases, Net (Schedule Of Depreciation Expense On Operating Lease Assets) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Leases, Operating [Abstract]
Depreciation Expense On Operating Lease Assets	$ 520	$ 671	$ 1,085	$ 1,363
Gross Remarketing (Gains) Losses	(86)	(108)	(141)	(178)
Depreciation expense on operating lease assets	$ 434	$ 563	$ 944	$ 1,185

Securitizations And Variable 82

Securitizations And Variable Interest Entities (Schedule Of Variable Interest Entities) (Details) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Variable Interest Entity [Line Items]
Total consoldiated involvement with VIEs	$ 40,618	$ 44,940
Assets of nonconsolidated variable interest entities	3,727	3,034
Maximum exposure to loss in nonconsolidated VIEs	4,288	3,527
Other assets	6,254	6,321
Consumer Portfolio Segment [Member] | Automobile Loan [Member]
Variable Interest Entity [Line Items]
Assets of nonconsolidated variable interest entities	3,727	3,034
Maximum exposure to loss in nonconsolidated VIEs	3,751	3,034
Variable Interest Entity, Consolidated, Carrying Amount, Assets	24,557	27,967
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets	24	0
Continuing Involvement with Continued to be Recognized Transferred Financial Assets, Amount Outstanding	10,000	10,600
Commercial Portfolio Segment [Member] | Automobile Loan [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	15,791	16,763
Commercial Portfolio Segment [Member] | Other Financing Receivables [Member]
Variable Interest Entity [Line Items]
Assets of nonconsolidated variable interest entities	0	0
Maximum exposure to loss in nonconsolidated VIEs	537	493
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets	246	210
Other assets	254	222
Accrued Liabilities	$ 8	$ 12

Securitizations And Variable 83

Securitizations And Variable Interest Entities (Schedule Of Cash Flow Received and Paid To Nonconsolidated Securitization Entities) (Details) - Consumer Portfolio Segment [Member] - Automobile Loan [Member] - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Cash Flow Received and Paid to Nonconsolidated Securitization Entities [Line Items]
Cash Flows Between Transferor and Transferee, Proceeds from New Transfers	$ 1,604
Cash Flows Between Transferor and Transferee, Servicing Fees	17	$ 13
Cash Flows Between Transferor and Transferee, Receipts on Transferor's Interest in Transferred Financial Assets, Other	$ 5

Securitizations And Variable 84

Securitizations And Variable Interest Entities (Schedule Of Quantitative Information and Net Credit Losses about Securitized and Other Financial Assets Managed Together) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Quantitative Information about Securitized and Other Financial Assets Managed Together [Line Items]
Principal Amount Outstanding on Loans Managed and Securitized or Asset-backed Financing Arrangement	$ 119,912		$ 119,912		$ 116,486
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement	637		637		721
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement	155	$ 101	336	$ 252
On-Balance Sheet Loans [Member]
Quantitative Information about Securitized and Other Financial Assets Managed Together [Line Items]
Principal Amount Outstanding on Loans Managed and Securitized or Asset-backed Financing Arrangement	112,668		112,668		111,705
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement	620		620		699
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement	152	100	331	250
On-Balance Sheet Loans [Member] | Consumer Portfolio Segment [Member] | Automobile Loan [Member]
Quantitative Information about Securitized and Other Financial Assets Managed Together [Line Items]
Principal Amount Outstanding on Loans Managed and Securitized or Asset-backed Financing Arrangement	63,281		63,281		64,292
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement	533		533		591
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement	148	96	321	228
On-Balance Sheet Loans [Member] | Consumer Portfolio Segment [Member] | Residential Mortgage [Member]
Quantitative Information about Securitized and Other Financial Assets Managed Together [Line Items]
Principal Amount Outstanding on Loans Managed and Securitized or Asset-backed Financing Arrangement	11,084		11,084		9,773
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement	87		87		108
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement	4	4	10	23
On-Balance Sheet Loans [Member] | Commercial Portfolio Segment [Member] | Automobile Loan [Member]
Quantitative Information about Securitized and Other Financial Assets Managed Together [Line Items]
Principal Amount Outstanding on Loans Managed and Securitized or Asset-backed Financing Arrangement	35,251		35,251		34,895
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement	0		0		0
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement	0	1	0	0
On-Balance Sheet Loans [Member] | Commercial Portfolio Segment [Member] | Other Financing Receivables [Member]
Quantitative Information about Securitized and Other Financial Assets Managed Together [Line Items]
Principal Amount Outstanding on Loans Managed and Securitized or Asset-backed Financing Arrangement	3,052		3,052		2,745
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement	0		0		0
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement	0	(1)	0	(1)
Off-Balance Sheet Loans [Member]
Quantitative Information about Securitized and Other Financial Assets Managed Together [Line Items]
Principal Amount Outstanding on Loans Managed and Securitized or Asset-backed Financing Arrangement	3,220		3,220		2,529
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement	11		11		9
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement	2	1	4	2
Off-Balance Sheet Loans [Member] | Consumer Portfolio Segment [Member] | Automobile Loan [Member]
Quantitative Information about Securitized and Other Financial Assets Managed Together [Line Items]
Principal Amount Outstanding on Loans Managed and Securitized or Asset-backed Financing Arrangement	3,220		3,220		2,529
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement	11		11		9
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement	2	1	4	2
Whole-Loan Transactions [Member]
Quantitative Information about Securitized and Other Financial Assets Managed Together [Line Items]
Principal Amount Outstanding on Loans Managed and Securitized or Asset-backed Financing Arrangement	4,024		4,024		2,252
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement	6		6		$ 13
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement	$ 1	$ 0	$ 1	$ 0

Servicing Activities (Schedule

Servicing Activities (Schedule Of Total Serviced Automobile Loans Outstanding) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Automobile Serviced Assets [Line Items]
Servicing fees	$ 18	$ 10	$ 31	$ 20
Automobile Loan [Member]
Automobile Serviced Assets [Line Items]
Servicing fees	18	$ 10	31	$ 20
Total Primary Serviced Assets	119,270		119,270		$ 119,808
Consumer Loan [Member] | On-Balance Sheet Loans [Member] | Automobile Loan [Member]
Automobile Serviced Assets [Line Items]
Total Primary Serviced Assets	63,113		63,113		64,067
Commercial Loan [Member] | On-Balance Sheet Loans [Member] | Automobile Loan [Member]
Automobile Serviced Assets [Line Items]
Total Primary Serviced Assets	35,251		35,251		34,895
Operating Leases [Member] | On-Balance Sheet Loans [Member] | Automobile Loan [Member]
Automobile Serviced Assets [Line Items]
Total Primary Serviced Assets	13,527		13,527		15,965
Other Assets [Member] | On-Balance Sheet Loans [Member] | Automobile Loan [Member]
Automobile Serviced Assets [Line Items]
Total Primary Serviced Assets	61		61		72
Securitizations [Member] | Off-Balance Sheet Loans [Member] | Automobile Loan [Member]
Automobile Serviced Assets [Line Items]
Total Primary Serviced Assets	3,252		3,252		2,550
Whole-Loan Transactions [Member] | Off-Balance Sheet Loans [Member] | Automobile Loan [Member]
Automobile Serviced Assets [Line Items]
Total Primary Serviced Assets	$ 4,066		$ 4,066		$ 2,259

Other Assets (Schedule Of Other

Other Assets (Schedule Of Other Assets) (Details) - USD ($) $ in Millions	Jun. 30, 2016	Jun. 01, 2016	Mar. 21, 2016	Dec. 31, 2015
Goodwill [Line Items]
Property, Plant and Equipment, Gross	$ 781			$ 691
Accumulated depreciation	(487)			(456)
Property, Plant and Equipment, Net	294			235
Restricted cash collections for securitization trusts	1,597			2,010
Deferred Tax Assets, Net	1,077			1,369
Nonmarketable equity investments	772			418
Interest Receivable	404			402
Goodwill	220			27
Derivative Asset, Fair Value, Gross Asset	209			233
Cash reserve deposits held for securitization trusts	197			252
Other accounts receivable	166			158
Restricted Cash and Cash Equivalents	106			120
Cash and securities collateral placed with counterparties	91			125
Other Assets, Miscellaneous	1,121			972
Other Assets	6,254			6,321
Federal Home Loan Bank Stock	310			391
Federal Reserve Bank Stock	435		$ 435	0
Insurance Operations [Member]
Goodwill [Line Items]
Goodwill	$ 27			27
Corporate and Other [Member]
Goodwill [Line Items]
Goodwill		$ 193		$ 0

Deposit Liabilities (Schedule O

Deposit Liabilities (Schedule Of Deposit Liabilities) (Details) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Deposits [Abstract]
Noninterest-bearing deposit liabilities	$ 94	$ 89
Interest-bearing Deposit Liabilities, by Component [Abstract]
Deposits, Savings Deposits	42,185	36,386
Time Deposits	30,323	29,774
Deposits, Retail	200	229
Total deposit liabilities	72,802	66,478
Time Deposits, $100,000 or More	11,500	11,500
Time Deposits, $250,000 or More, Domestic	$ 3,100	$ 3,200

Short-Term Borrowings (Schedule

Short-Term Borrowings (Schedule of Short-term Debt) (Details) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Short-term Debt [Line Items]
Demand Notes	$ 3,576	$ 3,369
Federal Home Loan Bank, Advances, Short-term	1,950	4,000
Securities Sold under Agreements to Repurchase, Gross	468	648
Other Short-term Borrowings	0	84
Short-term borrowings	5,994	8,101
Non-derivative Cash Collateral Placed with Counterparties Associated with the Repurchase Agreements	7	21
Unsecured Debt [Member]
Short-term Debt [Line Items]
Demand Notes	3,576	3,369
Federal Home Loan Bank, Advances, Short-term	0	0
Securities Sold under Agreements to Repurchase, Gross	0	0
Other Short-term Borrowings	0	84
Short-term borrowings	3,576	3,453
Secured Debt [Member]
Short-term Debt [Line Items]
Demand Notes	0	0
Federal Home Loan Bank, Advances, Short-term	1,950	4,000
Securities Sold under Agreements to Repurchase, Gross	468	648
Other Short-term Borrowings	0	0
Short-term borrowings	2,418	$ 4,648
Secured Debt [Member] | Maturity up to 30 days [Member]
Short-term Debt [Line Items]
Mortgage-backed Residential Securities Sold under Agreements to Repurchase, Maturity Period	369
Secured Debt [Member] | Maturity 31 to 60 Days [Member]
Short-term Debt [Line Items]
Mortgage-backed Residential Securities Sold under Agreements to Repurchase, Maturity Period	$ 99

Long-Term Debt (Long-Term Debt

Long-Term Debt (Long-Term Debt Portfolio) (Details) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Long-term Debt, Current Maturities	$ 14,859	$ 11,256
Long-term Debt, Excluding Current Maturities	45,644	54,647
Derivative, Amount of Hedged Item	537	331
Long-term debt	61,040	66,234
Unsecured Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Current Maturities	4,363	1,829
Long-term Debt, Excluding Current Maturities	16,683	18,803
Derivative, Amount of Hedged Item	520	334
Long-term debt	21,566	20,966
Secured Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Current Maturities	10,496	9,427
Long-term Debt, Excluding Current Maturities	28,961	35,844
Derivative, Amount of Hedged Item	17	(3)
Long-term debt	39,474	45,268
Trust Preferred Securities Subject to Mandatory Redemption [Member]
Debt Instrument [Line Items]
Long-term Debt, Excluding Current Maturities	2,600	2,600
Federal Home Loan Bank Advances [Member]
Debt Instrument [Line Items]
Long-term debt	5,400	5,400
Committed Funding Facilities [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	19,625	20,415
Committed Funding Facilities [Member] | Bank Funding Member | Secured Debt [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 4,000	$ 3,250

Long-Term Debt (Scheduled Remai

Long-Term Debt (Scheduled Remaining Maturity Of Long-Term Debt) (Details) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
2,016	$ 5,259
2,017	16,417
2,018	12,136
2,019	8,808
2,020	6,262
2021 and thereafter	11,621
Derivative, Amount of Hedged Item	537	$ 331
Long-term debt	61,040	66,234
Unsecured Debt [Member]
Debt Instrument [Line Items]
2,016	1,379
2,017	4,277
2,018	3,600
2,019	1,613
2,020	2,175
2021 and thereafter	8,002
Derivative, Amount of Hedged Item	520	334
Long-term debt	21,566	20,966
Unsecured Debt [Member] | Long-term Debt [Member]
Debt Instrument [Line Items]
2,016	1,419
2,017	4,365
2,018	3,700
2,019	1,650
2,020	2,212
2021 and thereafter	9,067
Derivative, Amount of Hedged Item	520
Long-term debt	22,933
Unsecured Debt [Member] | Original Issue Discount [Member]
Debt Instrument [Line Items]
2,016	(40)
2,017	(88)
2,018	(100)
2,019	(37)
2,020	(37)
2021 and thereafter	(1,065)
Derivative, Amount of Hedged Item	0
Long-term debt	(1,367)
Secured Debt [Member]
Debt Instrument [Line Items]
Derivative, Amount of Hedged Item	17	(3)
Long-term debt	39,474	$ 45,268
Secured Debt [Member] | Long-term Debt [Member]
Debt Instrument [Line Items]
2,016	3,880
2,017	12,140
2,018	8,536
2,019	7,195
2,020	4,087
2021 and thereafter	3,619
Derivative, Amount of Hedged Item	17
Long-term debt	$ 39,474

Long-Term Debt (Pledged Assets

Long-Term Debt (Pledged Assets Related to Secured Borrowings And Repurchase Agreement) (Details) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Pledged Assets related to secured borrowings [Line Items]
Pledged Financial Instruments, Not Separately Reported, Other Debt Securities Available-for-sale or Held-for-investment	$ 437	$ 2,420
Pledged Assets, Mortgage assets held for investment	11,006	9,743
Pledged Assets, Investment in operating leases	3,777	5,539
Pledged Assets, Not Separately Reported, Other	46	0
Pledged Assets, Other, Not Separately Reported on Statement of Financial Position	65,371	71,649
Secured Debt	41,892	49,916
Short-term borrowings	5,994	8,101
Ally Bank [Member]
Pledged Assets related to secured borrowings [Line Items]
Pledged Financial Instruments, Not Separately Reported, Other Debt Securities Available-for-sale or Held-for-investment	0	1,761
Pledged Assets, Mortgage assets held for investment	11,006	9,743
Pledged Assets, Investment in operating leases	2,059	3,205
Pledged Assets, Not Separately Reported, Other	0	0
Pledged Assets, Other, Not Separately Reported on Statement of Financial Position	40,394	43,053
Secured Debt	19,960	24,787
Pledged assets for Federal Home Loan Bank [Member] | Ally Bank [Member]
Pledged Assets related to secured borrowings [Line Items]
Pledged Assets, Other, Not Separately Reported on Statement of Financial Position	14,600	14,900
Pledged assets for Federal Reserve Bank [Member] | Ally Bank [Member]
Pledged Assets related to secured borrowings [Line Items]
Pledged Assets, Other, Not Separately Reported on Statement of Financial Position	2,600	2,900
Secured Debt [Member]
Pledged Assets related to secured borrowings [Line Items]
Short-term borrowings	2,418	4,648
Consumer Portfolio Segment [Member] | Automobile Loan [Member]
Pledged Assets related to secured borrowings [Line Items]
Pledged Assets, Not Separately Reported, Finance Receivables	30,911	34,324
Consumer Portfolio Segment [Member] | Automobile Loan [Member] | Ally Bank [Member]
Pledged Assets related to secured borrowings [Line Items]
Pledged Assets, Not Separately Reported, Finance Receivables	8,451	9,167
Commercial Portfolio Segment [Member] | Automobile Loan [Member]
Pledged Assets related to secured borrowings [Line Items]
Pledged Assets, Not Separately Reported, Finance Receivables	19,194	19,623
Commercial Portfolio Segment [Member] | Automobile Loan [Member] | Ally Bank [Member]
Pledged Assets related to secured borrowings [Line Items]
Pledged Assets, Not Separately Reported, Finance Receivables	$ 18,878	$ 19,177

Long-Term Debt Long-Term Debt (

Long-Term Debt Long-Term Debt (Narrative - Trust Preferred Securities) (Details) $ / shares in Units, $ in Billions	Jun. 30, 2016USD ($)$ / shares
Narrative - Trust Preferred Securities [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	8.125%
Preferred Stock, Liquidation Preference Per Share | $ / shares	$ 25
From and including February 15, 2016, to but excluding February 15, 2040, distributions will be payable at an annual rate equal to three-month London interbank offer rate plus:	5.785%
Ally has the right to defer payments of interest for a period not exceeding consecutive quarters of:	20
Percent of principle debt, plus accrued and unpaid interest is the redemption price if Ally redeems the Series 2 TRUPS on or after February 15, 2016.	100.00%
Fixed Income Interest Rate [Member]
Narrative - Trust Preferred Securities [Line Items]
Trust preferred securities | $	$ 2.6

Long-Term Debt (Committed Fundi

Long-Term Debt (Committed Funding Facilities) (Details) - Committed Funding Facilities [Member] - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Outstanding	$ 17,490	$ 20,164
Unused capacity	2,135	251
Line of Credit Facility, Maximum Borrowing Capacity	19,625	20,415
Bank Funding Member | Secured Debt [Member]
Debt Instrument [Line Items]
Outstanding	2,950	3,250
Unused capacity	1,050	0
Line of Credit Facility, Maximum Borrowing Capacity	4,000	3,250
Nonbank Funding [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Outstanding	14,540	16,914
Unused capacity	1,085	251
Line of Credit Facility, Maximum Borrowing Capacity	15,625	$ 17,165
Revolving secured funding facilities 1 year or greater [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 15,200

Accrued Expenses and Other Li94

Accrued Expenses and Other Liabilities (Schedule of Accrued Expenses and Other Liabilities) (Details) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Accounts Payable and Accrued Liabilities [Abstract]
Accounts Payable	$ 497	$ 391
Accrued Employee Benefits	196	242
Liability for Claims and Claims Adjustment Expense	164	169
Cash and securities collateral placed with counterparties	146	82
Derivative Liability, Fair Value, Gross Liability	87	145
Deferred Revenue	78	108
Other Accrued Liabilities	424	408
Accrued expenses and other liabilities	$ 1,592	$ 1,545

Preferred Stock (Schedule Of Pr

Preferred Stock (Schedule Of Preferred Stock) (Details) - USD ($) $ / shares in Units, $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2015	May 16, 2016
Schedule of Capitalization, Equity [Line Items]
Preferred stock	$ 0	$ 696
Preferred Stock, Liquidation Preference Per Share	$ 25
Series A Preferred Stock [Member]
Schedule of Capitalization, Equity [Line Items]
Preferred stock	$ 0	$ 696	$ 696
Preferred stock par value (per share)	$ 0	$ 0.01
Preferred Stock, Liquidation Preference Per Share	$ 0	$ 25
Preferred Stock, Shares Authorized	0	40,870,560
Preferred Stock, Shares Issued and Outstanding	0	27,870,560
Preferred Stock, Dividend Rate, Percentage	0.00%	8.50%
Preferred Stock, Dividend Payment Rate, Variable	0	Three month LIBOR + 6.243%
Stock Redeemed or Called During Period, Shares	27,870,560
Preferred Stock, Redemption Price Per Share			$ 25
Dividends Payable, Amount Per Share			$ 0.53
Preferred Stock Redemption, Aggregate Liquidation Preference	$ 697
Preferred Stock, Redemption Amount	712
Preferred stock dividends paid for Series A redemption	$ 15

Accumulated Other Comprehensi96

Accumulated Other Comprehensive Income (Loss) Rollforward (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax [Abstract]
Beginning Balance Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax			$ (159)	$ (21)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent	$ 120	$ (149)	262	(97)
Ending Balance Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	103	(118)	103	(118)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax [Abstract]
Beginning Balance Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax			9	36
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	(1)	3	7	(10)
Ending Balance Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	14	16	14	16
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax [Abstract]
Beginning Balance Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax			8	7
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Portion Attributable to Parent			0	0
Ending Balance Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	8	7	8	7
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax [Abstract]
Beginning Balance Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax			(89)	(88)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax, Portion Attributable to Parent			(1)	0
Ending Balance Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	(90)	(88)	(90)	(88)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Beginning Balance Accumulated Other Comprehensive Income (Loss), Net of Tax			(231)	(66)
Other Comprehensive Income (Loss), Net of Tax	120	(148)	266	(117)
Ending Balance Accumulated Other Comprehensive Income (Loss), Net of Tax	$ 35	$ (183)	$ 35	$ (183)

Accumulated Other Comprehensi97

Accumulated Other Comprehensive Income (Loss) Before and After Tax (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax, [Abstract]
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax	$ 185	$ (191)	$ 465	$ (53)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax	39	45	93	100
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax, Portion Attributable to Parent	146	(236)	372	(153)
Other Comprehensive Income (Loss), Available-for-sale Securities, Tax [Abstract]
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax	(25)	71	(129)	20
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax	1	(16)	(19)	(36)
Other Comprehensive Income (Loss), Available-for-sale Securities, Tax, Portion Attributable to Parent	(26)	87	(110)	56
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax [Abstract]
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax	160	(120)	336	(33)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax	40	29	74	64
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent	120	(149)	262	(97)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax [Abstract]
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax	(1)	4	12	(16)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, before Tax	(1)	1	(1)	43
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax, Portion Attributable to Parent	0	3	13	(59)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax [Abstract]
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax			5	(20)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	(1)	3	7	(10)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment Realized upon Sale or Liquidation, Net of Tax	(1)	1	(1)	23
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent	0	2	8	(33)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax [Abstract]
Other Comprehensive Income Unrealized Gain Loss On Net Investment Hedges Arising During the Period, Before Tax		(2)	(6)	16
Other Comprehensive Income (Loss), Reclassification Adjustment for Net Investment Hedges Included in Net Income, Discontinued Operation, before Tax				(4)
Other Comprehensive Income (Loss), Net Investment Hedges Attributable to Parent, before Tax				20
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax Effect [Abstract]
Other Comprehensive Income Unrealized Gain Loss On Net Investment Hedges Arising During the Period, Tax		1	3	(6)
Other Comprehensive Income (Loss), Reclassification Adjustment for Net Investment Hedges Included in Net Income, Discontinued Operation, Tax				1
Other Comprehensive Income (Loss), Net Investment Hedges Attributable to Parent, Tax				(7)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax [Abstract]
Other Comprehensive Income Unrealized Gain Loss On Net Investment Hedges Arising During the Period Net of Tax		(1)	(3)	10
Other Comprehensive Income (Loss), Reclassification Adjustment for Net Investment Hedges Included in Net Income, Discontinued Operation, Net of Tax				(3)
Other Comprehensive Income (Loss), Net Investment Hedges Attributable to Parent, Net of Tax				13
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Tax, [Abstract]
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Tax			(1)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Tax [Abstract]
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Tax			0
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax [Abstract]
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Net of Tax			(1)
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax [Abstract]
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax	0	(1)	(5)	6
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Tax	0	0	0	(20)
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax, Portion Attributable to Parent	0	(1)	(5)	26
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent	146	(235)	378	(192)
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent	(26)	87	(112)	75
Other Comprehensive Income (Loss), Net of Tax	$ 120	$ (148)	$ 266	$ (117)

Earnings Per Common Share (Sche

Earnings Per Common Share (Schedule Of Basic And Diluted Earnings Per Common Share) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Earnings Per Share [Abstract]
Net income (loss) from continuing operations	$ 357	$ 169	$ 604	$ 348
Preferred stock dividends	(15)	(1,251)	(30)	(1,318)
Net income (loss) from continuing operations attributable to common shareholders	342	(1,082)	574	(970)
Income (loss) from discontinued operations, net of tax	3	13	6	410
Net income (loss) attributable to common shareholders	$ 345	$ (1,069)	$ 580	$ (560)
Basic weighted-average common shares outstanding	485,370,318	482,847,164	484,801,782	482,550,842
Diluted weighted-average common shares outstanding	486,074,474	482,847,164	485,364,351	482,550,842
Stock Repurchase and Redemption Premium				$ 1,193
Earnings Per Share, Basic [Abstract]
Net income from continuing operations	$ 0.70	$ (2.24)	$ 1.18	$ (2.01)
Income from discontinued operations, net of tax	0.01	0.03	0.01	0.85
Net income	0.71	(2.22)	1.20	(1.16)
Earnings Per Share, Diluted [Abstract]
Net income from continuing operations	0.70	(2.24)	1.18	(2.01)
Income from discontinued operations, net of tax	0.01	0.03	0.01	0.85
Net income	$ 0.71	$ (2.22)	$ 1.19	$ (1.16)

Regulatory Capital (Schedule Of

Regulatory Capital (Schedule Of Regulatory Capital Amount And Ratios) (Details) - USD ($)	6 Months Ended
	Jun. 30, 2016	Mar. 21, 2016	Dec. 31, 2015
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common Equity Tier 1 Capital Required for Capital Adequacy to Risk-weighted Assets	4.50%
Tier 1 (to risk-weighted assets), Required minimum	6.00%
Total (to risk-weighted assets), Required minimum	8.00%
Common equity Tier 1 capital conservation buffer	2.50%
Federal Reserve Bank Stock	$ 435,000,000	$ 435,000,000	$ 0
assets greater than $50 billion	50,000,000,000
Dividends	$ 0.08
Common Stock, Shares, Outstanding	483,753,360		481,980,111
Series A Preferred Stock [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Preferred Stock, Notice of Redemption	700,000,000
Trust Preferred Securities Subject to Mandatory Redemption [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Preferred Stock, Notice of Redemption	500,000,000
Parent Company [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common Equity Tier 1 Capital Required for Capital Adequacy to Risk-weighted Assets	4.50%
Tier 1 (to risk-weighted assets), Required minimum	6.00%
Total (to risk-weighted assets), Required minimum	8.00%
Tier One Leverage Capital Required for Capital Adequacy to Average Assets	4.00%
Common Equity Tier 1 Capital	$ 12,829,000,000		$ 12,507,000,000
Percentage of Common Equity Tier 1 Capital to Risk-weighted Assets	9.59%		9.21%
Tier 1 (to risk-weighted assets), Amount	$ 14,959,000,000		$ 15,077,000,000
Tier 1 (to risk-weighted assets), Ratio	11.18%		11.10%
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets	6.00%
Total (to risk-weighted assets), Amount	$ 17,166,000,000		$ 17,005,000,000
Total (to risk-weighted assets), Ratio	12.83%		12.52%
Total (to risk-weighted assets), Well-capitalized minimum	10.00%
Tier 1 leverage (to adjusted average assets), Amount	$ 14,959,000,000		$ 15,077,000,000
Tier 1 leverage (to adjusted average assets), Ratio	9.63%		9.73%
Ally Bank [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common Equity Tier 1 Capital Required for Capital Adequacy to Risk-weighted Assets	4.50%
Tier 1 (to risk-weighted assets), Required minimum	6.00%
Total (to risk-weighted assets), Required minimum	8.00%
Tier One Leverage Capital Required for Capital Adequacy to Average Assets	15.00%
Common Equity Tier 1 Capital	$ 17,209,000,000		$ 16,594,000,000
Percentage of Common Equity Tier 1 Capital to Risk-weighted Assets	17.64%		17.05%
Common Equity Tier 1 Capital Required to be Well Capitalized to Risk-weighted Assets	6.50%
Tier 1 (to risk-weighted assets), Amount	$ 17,209,000,000		$ 16,594,000,000
Tier 1 (to risk-weighted assets), Ratio	17.64%		17.05%
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets	8.00%
Total (to risk-weighted assets), Amount	$ 17,712,000,000		$ 17,043,000,000
Total (to risk-weighted assets), Ratio	18.15%		17.51%
Total (to risk-weighted assets), Well-capitalized minimum	10.00%
Tier 1 leverage (to adjusted average assets), Amount	$ 17,209,000,000		$ 16,594,000,000
Tier 1 leverage (to adjusted average assets), Ratio	15.31%		15.38%
Tier 1 leverage (to adjusted average assets), Well-capitalized minimum	5.00%

Derivative Instruments And H100

Derivative Instruments And Hedging Activities (Narrative) (Details) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Forward Contract Indexed to Issuer's Equity [Line Items]
Derivative, Notional Amount	$ 44,260	$ 59,116
Cash Collateral Placed with Counterparties Excluding Cash Collateral Associated with Repurchase Agreements	84	103
Securities Collateral Placed with Counterparties	55	86
Non-derivative Cash Collateral Placed with Counterparties Associated with the Repurchase Agreements	7	21
Cash Collateral Received from Counterparties, Excluding Collateral Associated with Repurchase Agreements	146	82
Non-cash collateral received	2	7
Designated as Hedging Instrument [Member]
Forward Contract Indexed to Issuer's Equity [Line Items]
Derivative, Notional Amount	8,313	14,340
Designated as Hedging Instrument [Member] | Equity Contract [Member]
Forward Contract Indexed to Issuer's Equity [Line Items]
Derivative, Notional Amount	18	32
Designated as Hedging Instrument [Member] | Forward Contracts [Member] | Equity Contract [Member]
Forward Contract Indexed to Issuer's Equity [Line Items]
Derivative, Notional Amount	$ 17	$ 32

Derivative Instruments And H101

Derivative Instruments And Hedging Activities (Fair Value Amounts Of Derivative Instruments Reported On Our Condensed Consolidated Balance Sheet) (Details) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 209	$ 233
Derivative Liability, Fair Value, Gross Liability	87	145
Derivative, Notional Amount	44,260	59,116
Accrued Interest [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	15	46
Derivative Liability, Fair Value, Gross Liability	4	12
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	168	126
Derivative Liability, Fair Value, Gross Liability	22	10
Derivative, Notional Amount	8,313	14,340
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	164	126
Derivative Liability, Fair Value, Gross Liability	22	9
Derivative, Notional Amount	8,101	14,151
Hedge notional amount associated with debt maturing in five or more years	2,600
Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	4	0
Derivative Liability, Fair Value, Gross Liability	0	1
Derivative, Notional Amount	212	189
Fair Value Hedging [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Receive-fixed Swaps, Fair Value, Gross Asset	146	112
Receive-fixed Swaps, Fair Value, Gross Liability	0	3
Receive-fixed Swaps, Notional Amount	2,600	6,800
Pay-fixed Swaps, Fair Value, Gross Asset	0	13
Pay-fixed Swaps, Fair Value, Gross Liability	22	3
Pay-fixed Swaps, Notional Amount	4,800	6,800
Interest Rate Contract [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	36	105
Derivative Liability, Fair Value, Gross Liability	57	125
Derivative, Notional Amount	35,802	44,466
Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	3	0
Derivative Liability, Fair Value, Gross Liability	2	0
Derivative, Notional Amount	127	278
Equity Contract [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	2	2
Derivative Liability, Fair Value, Gross Liability	6	10
Derivative, Notional Amount	18	32
Interest Rate Swap [Member] | Interest Rate Contract [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	17	30
Derivative Liability, Fair Value, Gross Liability	39	51
Derivative, Notional Amount	1,461	6,101
Foreign Exchange Forward [Member] | Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	3	0
Derivative Liability, Fair Value, Gross Liability	2	0
Derivative, Notional Amount	127	278
Futures and Forwards [Member] | Interest Rate Contract [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	1	2
Derivative Liability, Fair Value, Gross Liability	0	2
Derivative, Notional Amount	501	1,905
Written Options [Member] | Interest Rate Contract [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	0	0
Derivative Liability, Fair Value, Gross Liability	18	72
Derivative, Notional Amount	16,920	18,220
Written Options [Member] | Equity Contract [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	0	0
Derivative Liability, Fair Value, Gross Liability	1	1
Derivative, Notional Amount	1	0
Purchased Options [Member] | Interest Rate Contract [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	18	73
Derivative Liability, Fair Value, Gross Liability	0	0
Derivative, Notional Amount	16,920	18,240
Purchased Options [Member] | Equity Contract [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	2	2
Derivative Liability, Fair Value, Gross Liability	0	0
Derivative, Notional Amount	0	0
Forward Contracts [Member] | Equity Contract [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	0	0
Derivative Liability, Fair Value, Gross Liability	5	9
Derivative, Notional Amount	17	32
Other Trading [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	41	107
Derivative Liability, Fair Value, Gross Liability	65	135
Derivative, Notional Amount	35,947	44,776
Secured Debt [Member] | Fair Value Hedging [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Receive-fixed Swaps, Fair Value, Gross Asset	18	1
Receive-fixed Swaps, Fair Value, Gross Liability	0	2
Receive-fixed Swaps, Notional Amount	$ 698	$ 500

Derivative Instruments And H102

Derivative Instruments And Hedging Activities (Statement Of Gains and Losses on Derivative Instruments Reported in Statement of Comprehensive Income) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Interest and Fee Income, Loans and Leases	$ (1,265)	$ (1,118)	$ (2,500)	$ (2,192)
Interest on long-term debt	(436)	(419)	(878)	(848)
Gain (loss) on mortgage and automotive loans, net	3	1	4	47
Other income, net of losses	96	84	191	191
Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments	1	5	3	(9)
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments	0	2	(5)	(130)
Gain (Loss) on Equity Forward Contract Not Designated as Hedging Instruments	(1)	3	(2)	(3)
Gain (Loss) on Derivative Instruments, Net, Pretax	0	16	(9)	(127)
Interest Gain For Qualifying Accounting Hedges Of Debt	11	24	27	47
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	4	1	9	1
Gains on amortization of deferred basis adjustments on the hedged items	21	16	39	44
Gain (Loss) from Revaulation of Foreign-Denominated Debt or Receivable	(1)	1	3	133
Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net	0	6	(5)	15
Interest Rate Contract [Member] | Designated as Hedging Instrument [Member] | Gain (Loss) Recognized in Earnings on Derivatives [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Interest and Fee Income, Loans and Leases	(6)	7	34	16
Interest on long-term debt	51	(97)	242	(11)
Interest Rate Contract [Member] | Designated as Hedging Instrument [Member] | Gain (Loss) Recognized in Earnings on Hedged Item [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Interest and Fee Income, Loans and Leases	5	2	(33)	(35)
Interest on long-term debt	(50)	94	(246)	7
Interest Rate Contract [Member] | Designated as Hedging Instrument [Member] | Gain (loss) Excluded from Earnings on Derivatives [Domain]
Derivative Instruments, Gain (Loss) [Line Items]
Interest and Fee Income, Loans and Leases	(5)	(15)	(12)	(32)
Interest Rate Contract [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on mortgage and automotive loans, net	0	2	0	0
Other income, net of losses	1	3	3	(9)
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Interest on long-term debt	(1)	5	(2)	(138)
Other income, net of losses	1	(3)	(3)	8
Forward Contracts [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other income, net of losses	(1)	$ 3	(2)	$ (3)
Secured Debt [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Interest Gain For Qualifying Accounting Hedges Of Debt	$ 2		$ 3

Derivative Instruments And H103

Derivative Instruments And Hedging Activities (Derivative Instruments Used In Net Investment Hedge Accounting Relationships) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Cumulative Translation Adjustment, Net of Tax, Period Increase (Decrease)	$ 0	$ 3
Foreign Exchange Contract [Member] | Net Investment Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	0	0	$ 0	$ (4)
Net Investment Hedges - Total Other Income, Net of Losses	0	0	0	(4)
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	$ 0	$ (2)	$ (6)	$ 20

Income Taxes (Income Tax Expens

Income Taxes (Income Tax Expense) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Income Tax Disclosure [Abstract]
Income tax expense (benefit) from continuing operations	$ 56	$ 94	$ 206	$ 197
Other Tax Expense (Benefit)	175
Deferred Tax Assets, Capital Loss Carryforwards	$ 93		$ 93

Fair Value (Fair Value Measurme

Fair Value (Fair Value Measurment - Recurring Basis) (Details) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	$ 18,197	$ 17,157
Available-for-sale, Equity Investment in Any One Industry Did Not Exceed Percentage	18.00%	14.00%
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	$ 18,197	$ 17,157
Retained Interest, Fair Value Disclosure	31	40
Derivative Assets	209	233
Assets, Fair Value Disclosure	18,437	17,430
Derivative Financial Instruments, Liabilities, Fair Value Disclosure	(87)	(145)
Liabilities, Fair Value Disclosure	(87)	(145)
Fair Value, Measurements, Recurring [Member] | Interest Rate Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Financial Instruments, Liabilities, Fair Value Disclosure	(79)	(135)
Fair Value, Measurements, Recurring [Member] | Foreign Exchange Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Financial Instruments, Liabilities, Fair Value Disclosure	(2)	(1)
Fair Value, Measurements, Recurring [Member] | Other Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Financial Instruments, Liabilities, Fair Value Disclosure	(6)	(9)
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	17,598	16,440
Fair Value, Measurements, Recurring [Member] | US Treasury and Government [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	275	1,741
Fair Value, Measurements, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	733	716
Fair Value, Measurements, Recurring [Member] | Foreign Government Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	191	177
Fair Value, Measurements, Recurring [Member] | Residential Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	12,617	10,366
Fair Value, Measurements, Recurring [Member] | Commercial Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	506	481
Fair Value, Measurements, Recurring [Member] | Asset-backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	1,674	1,755
Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	1,602	1,204
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	599	717
Fair Value, Measurements, Recurring [Member] | Interest Rate Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets	200	231
Fair Value, Measurements, Recurring [Member] | Foreign Exchange Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets	7
Fair Value, Measurements, Recurring [Member] | Other Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets	2	2
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	885	2,196
Retained Interest, Fair Value Disclosure	0	0
Derivative Assets	3	4
Assets, Fair Value Disclosure	888	2,200
Derivative Financial Instruments, Liabilities, Fair Value Disclosure	(1)	(3)
Liabilities, Fair Value Disclosure	(1)	(3)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Interest Rate Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Financial Instruments, Liabilities, Fair Value Disclosure	0	(2)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Foreign Exchange Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Financial Instruments, Liabilities, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Other Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Financial Instruments, Liabilities, Fair Value Disclosure	(1)	(1)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	286	1,479
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | US Treasury and Government [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	275	1,469
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | US States and Political Subdivisions Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Foreign Government Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	11	10
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Residential Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Commercial Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Asset-backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	599	717
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Interest Rate Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets	1	2
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Foreign Exchange Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Other Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets	2	2
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	17,312	14,961
Retained Interest, Fair Value Disclosure	0	0
Derivative Assets	206	229
Assets, Fair Value Disclosure	17,518	15,190
Derivative Financial Instruments, Liabilities, Fair Value Disclosure	(86)	(142)
Liabilities, Fair Value Disclosure	(86)	(142)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Interest Rate Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Financial Instruments, Liabilities, Fair Value Disclosure	(79)	(133)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Foreign Exchange Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Financial Instruments, Liabilities, Fair Value Disclosure	(2)	(1)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Other Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Financial Instruments, Liabilities, Fair Value Disclosure	(5)	(8)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	17,312	14,961
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | US Treasury and Government [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	272
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | US States and Political Subdivisions Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	733	716
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Foreign Government Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	180	167
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Residential Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	12,617	10,366
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Commercial Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	506	481
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Asset-backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	1,674	1,755
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	1,602	1,204
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Interest Rate Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets	199	229
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Foreign Exchange Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets	7
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Other Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Retained Interest, Fair Value Disclosure	31	40
Derivative Assets	0	0
Assets, Fair Value Disclosure	31	40
Derivative Financial Instruments, Liabilities, Fair Value Disclosure	0	0
Liabilities, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Interest Rate Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Financial Instruments, Liabilities, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Foreign Exchange Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Financial Instruments, Liabilities, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Other Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Financial Instruments, Liabilities, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | US Treasury and Government [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | US States and Political Subdivisions Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Foreign Government Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Residential Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Commercial Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Asset-backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Interest Rate Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Foreign Exchange Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Other Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets	$ 0	$ 0

Fair Value (Fair Value Measurem

Fair Value (Fair Value Measurement - Reconciliation of Level 3 Assets And Liabilities) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Assets, Beginning balance	$ 31	$ 45	$ 40	$ 50
Net realized/unrealized gains (losses) included in earnings, Assets	1	5	3	8
Net realized/unrealized gains (losses) included in other comprehensive income, Assets	0	0	0	0
Purchases, Assets	0	0	0	0
Sales, Assets	2	0	6	0
Issuances, Assets	0	0	0	1
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	(3)	(14)	(18)	(23)
Fair Value, Assets, Ending balance	31	36	31	36
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0	1	0	1
Retained Interest [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Assets, Beginning balance	31	42	40	47
Net realized/unrealized gains (losses) included in earnings, Assets	1	4	3	7
Net realized/unrealized gains (losses) included in other comprehensive income, Assets	0	0	0	0
Purchases, Assets	0	0	0	0
Sales, Assets	2	0	6	0
Issuances, Assets	0	0	0	1
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	(3)	(14)	(18)	(23)
Fair Value, Assets, Ending balance	31	32	31	32
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	$ 0	0	$ 0	0
Mortgage Loans Held-for-Sale, Net [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Assets, Beginning balance		3		3
Net realized/unrealized gains (losses) included in earnings, Assets		1		1
Net realized/unrealized gains (losses) included in other comprehensive income, Assets		0		0
Purchases, Assets		0		0
Sales, Assets		0		0
Issuances, Assets		0		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements		0		0
Fair Value, Assets, Ending balance		4		4
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		$ 1		$ 1

Fair Value (Fair Value Measu107

Fair Value (Fair Value Measurement - Nonrecurring Basis) (Details) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, net	$ 15	$ 105
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, net	0	0
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, net	0	0
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, net	15	$ 105
Fair Value, Measurements, Nonrecurring [Member] | Loans held-for-sale, Automotive [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, net			$ 1,356
Lower of cost or fair value or valuation reserve allowance			(12)
Fair Value, Measurements, Nonrecurring [Member] | Loans held-for-sale, Mortgage [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, net			10
Lower of cost or fair value or valuation reserve allowance			(1)
Fair Value, Measurements, Nonrecurring [Member] | Loans held-for-sale, Other [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, net			36
Lower of cost or fair value or valuation reserve allowance			0
Fair Value, Measurements, Nonrecurring [Member] | Loans held-for-sale, Total [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, net	15		1,402
Lower of cost or fair value or valuation reserve allowance	0		(13)
Fair Value, Measurements, Nonrecurring [Member] | Commercial Finance Receivables And Loans, Automotive [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Commercial Finance Receivables and Loans, Net, Fair Value	43		24
Lower of cost or fair value or valuation reserve allowance	(6)		(8)
Fair Value, Measurements, Nonrecurring [Member] | Commercial Finance Receivables And Loans, Other [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Commercial Finance Receivables and Loans, Net, Fair Value	46		34
Lower of cost or fair value or valuation reserve allowance	(18)		(11)
Fair Value, Measurements, Nonrecurring [Member] | Commercial Loan [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Commercial Finance Receivables and Loans, Net, Fair Value	89		58
Lower of cost or fair value or valuation reserve allowance	(24)		(19)
Fair Value, Measurements, Nonrecurring [Member] | Repossessed And Foreclosed Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Assets, Fair Value Disclosure	10		10
Lower of cost or fair value or valuation reserve allowance	(3)		(3)
Fair Value, Measurements, Nonrecurring [Member] | Other Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Assets, Fair Value Disclosure	5		2
Lower of cost or fair value or valuation reserve allowance	0		0
Fair Value, Measurements, Nonrecurring [Member] | Assets, Total [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure	119		1,472
Lower of cost or fair value or valuation reserve allowance	(27)		(35)
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member] | Loans held-for-sale, Automotive [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, net			0
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member] | Loans held-for-sale, Mortgage [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, net			0
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member] | Loans held-for-sale, Other [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, net			0
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member] | Loans held-for-sale, Total [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, net	0		0
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member] | Commercial Finance Receivables And Loans, Automotive [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Commercial Finance Receivables and Loans, Net, Fair Value	0		0
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member] | Commercial Finance Receivables And Loans, Other [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Commercial Finance Receivables and Loans, Net, Fair Value	0		0
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member] | Commercial Loan [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Commercial Finance Receivables and Loans, Net, Fair Value	0		0
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member] | Repossessed And Foreclosed Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Assets, Fair Value Disclosure	0		0
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member] | Other Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Assets, Fair Value Disclosure	0		0
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member] | Assets, Total [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure	0		0
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] | Loans held-for-sale, Automotive [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, net			0
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] | Loans held-for-sale, Mortgage [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, net			0
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] | Loans held-for-sale, Other [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, net			0
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] | Loans held-for-sale, Total [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, net	0		0
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] | Commercial Finance Receivables And Loans, Automotive [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Commercial Finance Receivables and Loans, Net, Fair Value	0		0
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] | Commercial Finance Receivables And Loans, Other [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Commercial Finance Receivables and Loans, Net, Fair Value	0		0
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] | Commercial Loan [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Commercial Finance Receivables and Loans, Net, Fair Value	0		0
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] | Repossessed And Foreclosed Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Assets, Fair Value Disclosure	0		0
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] | Other Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Assets, Fair Value Disclosure	0		0
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] | Assets, Total [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure	0		0
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] | Loans held-for-sale, Automotive [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, net			1,356
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] | Loans held-for-sale, Mortgage [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, net			10
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] | Loans held-for-sale, Other [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, net			36
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] | Loans held-for-sale, Total [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, net	15		1,402
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] | Commercial Finance Receivables And Loans, Automotive [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Commercial Finance Receivables and Loans, Net, Fair Value	43		24
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] | Commercial Finance Receivables And Loans, Other [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Commercial Finance Receivables and Loans, Net, Fair Value	46		34
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] | Commercial Loan [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Commercial Finance Receivables and Loans, Net, Fair Value	89		58
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] | Repossessed And Foreclosed Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Assets, Fair Value Disclosure	10		10
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] | Other Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Assets, Fair Value Disclosure	5		2
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] | Assets, Total [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure	$ 119		$ 1,472

Fair Value Fair Value (Fair Val

Fair Value Fair Value (Fair Value Measurements - Nonrecurring Fair Value Inputs) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Loans held-for-sale, net	$ 15	$ 105
Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Loans held-for-sale, net	$ 15	$ 105
Fair Value, Measurements, Nonrecurring [Member] | Loans held-for-sale, Automotive [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Loans held-for-sale, net			$ 1,356
Fair Value, Measurements, Nonrecurring [Member] | Loans held-for-sale, Automotive [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Loans held-for-sale, net			$ 1,356
Income Approach Valuation Technique [Member] | Loans held-for-sale, Automotive [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Prepayment Rate	1.30%
Income Approach Valuation Technique [Member] | Minimum [Member] | Loans held-for-sale, Automotive [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Loss Severity	0.00%
Fair Value Inputs, Discount Rate	0.00%
Income Approach Valuation Technique [Member] | Maximum [Member] | Loans held-for-sale, Automotive [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Loss Severity	4.50%
Fair Value Inputs, Discount Rate	6.70%

Fair Value (Fair Value of Finan

Fair Value (Fair Value of Financial Instruments) (Details) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity securities	$ 571	$ 0
Loans held-for-sale, net	15	105
Total finance receivables and loans, net	111,564	110,546
Nonmarketable equity investments	772	418
Deposit liabilities	72,802	66,478
Short-term borrowings	5,994	8,101
Long-term debt	61,040	66,234
Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity securities	571
Loans held-for-sale, net	15	105
Total finance receivables and loans, net	111,564	110,546
Nonmarketable equity investments	772	418
Deposit liabilities	72,802	66,478
Short-term borrowings	5,994	8,101
Long-term debt	61,040	66,234
Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity securities	0
Loans held-for-sale, net	0	0
Total finance receivables and loans, net	0	0
Nonmarketable equity investments	0	0
Deposit liabilities	0	0
Short-term borrowings	0	0
Long-term debt	0	0
Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity securities	579
Loans held-for-sale, net	0	0
Total finance receivables and loans, net	0	0
Nonmarketable equity investments	745	391
Deposit liabilities	0	0
Short-term borrowings	0	0
Long-term debt	23,407	23,018
Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity securities	0
Loans held-for-sale, net	15	105
Total finance receivables and loans, net	112,632	110,737
Nonmarketable equity investments	43	42
Deposit liabilities	73,528	66,889
Short-term borrowings	5,996	8,102
Long-term debt	39,574	45,157
Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity securities	579
Loans held-for-sale, net	15	105
Total finance receivables and loans, net	112,632	110,737
Nonmarketable equity investments	788	433
Deposit liabilities	73,528	66,889
Short-term borrowings	5,996	8,102
Long-term debt	$ 62,981	$ 68,175

Offsetting Assets and Liabil110

Offsetting Assets and Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 209	$ 233
Derivative Asset, Fair Value, Amount Offset Against Collateral	0	0
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	(45)	(78)
Derivative, Collateral, Right to Reclaim Cash	(143)	(67)
Derivative Liability, Fair Value, Gross Liability	(87)	(145)
Derivative Liability, Fair Value, Amount Offset Against Collateral	0	0
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	45	78
Derivative, Collateral, Obligation to Return Cash	21	2
Securities Sold under Agreements to Repurchase, Gross	(468)	(648)
Non-cash derivative collateral pledged to us is not recorded on our Condensed Consolidated Balance Sheet unless certain conditions are met.	2	7
Net Asset [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	207	224
Derivative Asset, Fair Value, Amount Offset Against Collateral	0	0
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	(44)	(69)
Derivative, Collateral, Right to Reclaim Cash	(143)	(67)
Derivative assets in net liability positions [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	2	9
Derivative Asset, Fair Value, Amount Offset Against Collateral	0	0
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	(1)	(9)
Derivative, Collateral, Right to Reclaim Cash	0	0
Net liability [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability	(38)	(68)
Derivative Liability, Fair Value, Amount Offset Against Collateral	0	0
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	1	9
Derivative, Collateral, Obligation to Return Cash	21	2
Derivative liabilities in net asset positions [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability	(44)	(69)
Derivative Liability, Fair Value, Amount Offset Against Collateral	0	0
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	44	69
Derivative, Collateral, Obligation to Return Cash	0	0
Derivative liabilities with no offsetting arrangements [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability	(5)	(8)
Derivative Liability, Fair Value, Amount Offset Against Collateral	0	0
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	0	0
Derivative, Collateral, Obligation to Return Cash	0	0
Securities sold under agreement to repurchase [Member]
Derivative [Line Items]
Securities Sold under Agreements to Repurchase, Gross	(468)	(648)
Securities Sold under Agreements to Repurchase, Amount Offset Against Collateral	0	0
Securities Sold under Agreements to Repurchase, Amount Offset Against Collateral, Net	(468)	(648)
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities	0	0
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Cash	468	648
Securities Sold under Agreements to Repurchase	0	0
Assets, Total [Member]
Derivative [Line Items]
Derivative, Fair Value, Amount Offset Against Collateral, Net	209	233
Derivative Assets	21	88
Assets, Total [Member] | Net Asset [Member]
Derivative [Line Items]
Derivative, Fair Value, Amount Offset Against Collateral, Net	207	224
Derivative Assets	20	88
Assets, Total [Member] | Derivative assets in net liability positions [Member]
Derivative [Line Items]
Derivative, Fair Value, Amount Offset Against Collateral, Net	2	9
Derivative Assets	1	0
Liabilities, Total [Member]
Derivative [Line Items]
Derivative, Fair Value, Amount Offset Against Collateral, Net	(87)	(145)
Derivative Liability	(21)	(65)
Gross Amounts of Recognized Liabilities	(555)	(793)
Gross Amounts Offset in the Condensed Consolidated Balance Sheet	0	0
Net Amounts of Liabilities Presented in the Condensed Consolidated Balance Sheet	(555)	(793)
Gross Amounts Not Offset Against Collateral	45	78
Obligation to Return Cash	489	650
Net Amount	(21)	(65)
Liabilities, Total [Member] | Net liability [Member]
Derivative [Line Items]
Derivative, Fair Value, Amount Offset Against Collateral, Net	(38)	(68)
Derivative Liability	(16)	(57)
Liabilities, Total [Member] | Derivative liabilities in net asset positions [Member]
Derivative [Line Items]
Derivative, Fair Value, Amount Offset Against Collateral, Net	(44)	(69)
Derivative Liability	0	0
Liabilities, Total [Member] | Derivative liabilities with no offsetting arrangements [Member]
Derivative [Line Items]
Derivative, Fair Value, Amount Offset Against Collateral, Net	(5)	(8)
Derivative Liability	$ (5)	$ (8)

Segment And Geographic Infor111

Segment And Geographic Information (Financial Information Operating Segments) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Segment Reporting Information [Line Items]
Net financing revenue (loss)	$ 984	$ 916	$ 1,935	$ 1,766
Total other revenue	374	211	750	454
Total net revenue (loss)	1,358	1,127	2,685	2,220
Provision for loan losses	172	140	392	256
Total noninterest expense	773	724	1,483	1,419
Income (loss) from continuing operations before income tax expense	413	263	810	545
Assets	157,931	156,278	157,931	156,278	$ 158,581
Net Interest Income (Loss) after Provision for Loan Losses	812	776	1,543	1,510
Automotive Finance Operations [Member]
Segment Reporting Information [Line Items]
Net financing revenue (loss)	929	850	1,825	1,659
Total other revenue	77	55	154	107
Total net revenue (loss)	1,006	905	1,979	1,766
Provision for loan losses	170	132	379	259
Total noninterest expense	410	400	837	828
Income (loss) from continuing operations before income tax expense	426	373	763	679
Assets	112,356	113,607	112,356	113,607
Insurance Operations [Member]
Segment Reporting Information [Line Items]
Net financing revenue (loss)	16	14	30	26
Total other revenue	259	268	513	536
Total net revenue (loss)	275	282	543	562
Provision for loan losses	0	0	0	0
Total noninterest expense	293	267	511	469
Income (loss) from continuing operations before income tax expense	(18)	15	32	93
Assets	7,193	7,260	7,193	7,260
Mortgage Finance Operations [Member]
Segment Reporting Information [Line Items]
Net financing revenue (loss)	26	11	46	22
Total other revenue	0	0	0	0
Total net revenue (loss)	26	11	46	22
Provision for loan losses	0	4	3	6
Total noninterest expense	17	10	32	18
Income (loss) from continuing operations before income tax expense	9	(3)	11	(2)
Assets	8,014	5,623	8,014	5,623
Corporate Finance Operations [Member]
Segment Reporting Information [Line Items]
Net financing revenue (loss)	29	22	57	42
Total other revenue	4	6	10	12
Total net revenue (loss)	33	28	67	54
Provision for loan losses	3	4	9	(1)
Total noninterest expense	16	14	33	28
Income (loss) from continuing operations before income tax expense	14	10	25	27
Assets	2,989	2,132	2,989	2,132
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Net financing revenue (loss)	(16)	19	(23)	17
Total other revenue	34	(118)	73	(201)
Total net revenue (loss)	18	(99)	50	(184)
Provision for loan losses	(1)	0	1	(8)
Total noninterest expense	37	33	70	76
Income (loss) from continuing operations before income tax expense	(18)	(132)	(21)	(252)
Assets	$ 27,379	$ 27,656	$ 27,379	$ 27,656

Segment And Geographic Infor112

Segment And Geographic Information (Information Concerning Principal Geographic Areas) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net revenue (loss)	$ 1,358	$ 1,127	$ 2,685	$ 2,220
Income (loss) from continuing operations before income tax expense	413	263	810	545
Net income (loss)	360	182	610	758
Foreign [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net revenue (loss)	24	28	45	53
Income (loss) from continuing operations before income tax expense	12	13	22	28
Net income (loss)	8	30	15	501
Canada [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net revenue (loss)	24	28	45	52
Income (loss) from continuing operations before income tax expense	12	13	22	24
Net income (loss)	10	13	18	21
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net revenue (loss)	0	0	0	1
Income (loss) from continuing operations before income tax expense	0	0	0	4
Net income (loss)	(2)	17	(3)	28
Asia-Pacific [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net revenue (loss)				0
Income (loss) from continuing operations before income tax expense				0
Net income (loss)				452
Domestic [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net revenue (loss)	1,334	1,099	2,640	2,167
Income (loss) from continuing operations before income tax expense	401	250	788	517
Net income (loss)	$ 352	$ 152	$ 595	$ 257

Parent And Guarantor Consoli113

Parent And Guarantor Consolidating Financial Statements (Schedule of Consolidating Statement of Income) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Condensed Income Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	$ 1,265	$ 1,118	$ 2,500	$ 2,192
Interest on loans held-for-sale	0	14	0	38
Interest and dividends on investment securities	99	93	201	181
Interest on cash and cash equivalents	4	2	7	4
Operating leases	701	860	1,470	1,756
Total financing revenue and other interest income	2,069	2,087	4,178	4,171
Interest on deposits	203	177	396	349
Interest on short-term borrowings	12	12	25	23
Interest on long-term debt	436	419	878	848
Interest Expense, Debt	0	0	0	0
Total interest expense	651	608	1,299	1,220
Depreciation expense on operating lease assets	434	563	944	1,185
Net financing revenue (loss)	984	916	1,935	1,766
Bank Subsidiary		0		0
Nonbank subsidiaries	0	0	0	0
Servicing fees	18	10	31	20
Insurance premiums and service revenue earned	236	237	466	470
Gain (loss) on mortgage and automotive loans, net	3	1	4	47
Loss on extinguishment of debt	0	(156)	(4)	(354)
Other gain on investments, net	39	45	93	100
Other income, net of losses	96	84	191	191
Total other revenue	374	211	750	454
Total net revenue (loss)	1,358	1,127	2,685	2,220
Provision for loan losses	172	140	392	256
Compensation and benefits expense	242	236	494	491
Insurance losses and loss adjustment expenses	145	122	218	178
Other operating expenses	386	366	771	750
Total noninterest expense	773	724	1,483	1,419
(Loss) income from continuing operations before income tax (benefit) expense and undistributed income of subsidiaries	413	263	810	545
Income tax expense (benefit) from continuing operations	56	94	206	197
Income (Loss) from Continuing Operations Attributable to Parent	357	169	604	348
Income (loss) from discontinued operations, net of tax	3	13	6	410
Undistributed income of bank subsidiaries	0	0	0	0
Undistributed income of nonbank subsidiaries	0	0	0	0
Net income (loss)	360	182	610	758
Other Comprehensive Income (Loss), Net of Tax	120	(148)	266	(117)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	480	34	876	641
Parent [Member]
Condensed Income Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	(28)	(16)	(66)	(12)
Interest on loans held-for-sale		0		0
Interest and dividends on investment securities	0	0	0	0
Interest on cash and cash equivalents	1	1	2	1
Operating leases	5	0	10	0
Total financing revenue and other interest income	(19)	(13)	(48)	1
Interest on deposits	2	2	4	5
Interest on short-term borrowings	10	10	20	20
Interest on long-term debt	290	292	578	584
Interest Expense, Debt	4	6	9	25
Total interest expense	306	310	611	634
Depreciation expense on operating lease assets	3	0	7	0
Net financing revenue (loss)	(328)	(323)	(666)	(633)
Bank Subsidiary		400		525
Nonbank subsidiaries	148	248	629	486
Insurance premiums and service revenue earned	0	0	0	0
Gain (loss) on mortgage and automotive loans, net	(2)	0	(5)	(8)
Loss on extinguishment of debt		(156)	(2)	(353)
Other gain on investments, net	0	0	0	0
Other income, net of losses	317	327	690	678
Total other revenue	315	171	683	317
Total net revenue (loss)	135	496	646	695
Provision for loan losses	88	(36)	148	64
Compensation and benefits expense	139	139	286	293
Insurance losses and loss adjustment expenses	0	0	0	0
Other operating expenses	317	310	656	620
Total noninterest expense	456	449	942	913
(Loss) income from continuing operations before income tax (benefit) expense and undistributed income of subsidiaries	(409)	83	(444)	(282)
Income tax expense (benefit) from continuing operations	(65)	(87)	(108)	(202)
Income (Loss) from Continuing Operations Attributable to Parent	(344)	170	(336)	(80)
Income (loss) from discontinued operations, net of tax	3	(15)	9	372
Undistributed income of bank subsidiaries	336	(132)	607	48
Undistributed income of nonbank subsidiaries	365	159	330	418
Net income (loss)	360	182	610	758
Other Comprehensive Income (Loss), Net of Tax	120	(148)	266	(117)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	480	34	876	641
Guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	0	0	0	0
Interest on loans held-for-sale		0		0
Interest and dividends on investment securities	0	0	0	0
Interest on cash and cash equivalents	0	0	0	0
Operating leases	0	0	0	0
Total financing revenue and other interest income	0	0	0	0
Interest on deposits	0	0	0	0
Interest on short-term borrowings	0	0	0	0
Interest on long-term debt	0	0	0	0
Interest Expense, Debt	0	0	0	0
Total interest expense	0	0	0	0
Depreciation expense on operating lease assets	0	0	0	0
Net financing revenue (loss)	0	0	0	0
Bank Subsidiary		400		525
Nonbank subsidiaries	0	0	0	0
Insurance premiums and service revenue earned	0	0	0	0
Gain (loss) on mortgage and automotive loans, net	0	0	0	0
Loss on extinguishment of debt		0	0	0
Other gain on investments, net	0	0	0	0
Other income, net of losses	0	0	0	0
Total other revenue	0	0	0	0
Total net revenue (loss)	0	400	0	525
Provision for loan losses	0	0	0	0
Compensation and benefits expense	0	0	0	0
Insurance losses and loss adjustment expenses	0	0	0	0
Other operating expenses	0	0	0	0
Total noninterest expense	0	0	0	0
(Loss) income from continuing operations before income tax (benefit) expense and undistributed income of subsidiaries	0	400	0	525
Income tax expense (benefit) from continuing operations	(82)	0	(82)	0
Income (Loss) from Continuing Operations Attributable to Parent	82	400	82	525
Income (loss) from discontinued operations, net of tax	0	0	0	0
Undistributed income of bank subsidiaries	336	(132)	607	48
Undistributed income of nonbank subsidiaries	(2)	0	(2)	0
Net income (loss)	416	268	687	573
Other Comprehensive Income (Loss), Net of Tax	62	(67)	145	(25)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	478	201	832	548
Non-Guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	1,293	1,134	2,566	2,204
Interest on loans held-for-sale		14		38
Interest and dividends on investment securities	99	93	201	181
Interest on cash and cash equivalents	3	1	5	3
Operating leases	696	860	1,460	1,756
Total financing revenue and other interest income	2,095	2,109	4,241	4,207
Interest on deposits	201	175	392	344
Interest on short-term borrowings	2	2	5	3
Interest on long-term debt	146	127	300	264
Interest Expense, Debt	3	3	6	12
Total interest expense	352	307	703	623
Depreciation expense on operating lease assets	431	563	937	1,185
Net financing revenue (loss)	1,312	1,239	2,601	2,399
Bank Subsidiary		0		0
Nonbank subsidiaries	0	0	0	0
Insurance premiums and service revenue earned	236	237	466	470
Gain (loss) on mortgage and automotive loans, net	5	1	9	55
Loss on extinguishment of debt		0	(2)	(1)
Other gain on investments, net	39	45	93	100
Other income, net of losses	214	334	430	690
Total other revenue	494	617	996	1,314
Total net revenue (loss)	1,806	1,856	3,597	3,713
Provision for loan losses	84	176	244	192
Compensation and benefits expense	103	197	208	422
Insurance losses and loss adjustment expenses	145	122	218	178
Other operating expenses	502	533	1,044	1,083
Total noninterest expense	750	852	1,470	1,683
(Loss) income from continuing operations before income tax (benefit) expense and undistributed income of subsidiaries	972	828	1,883	1,838
Income tax expense (benefit) from continuing operations	203	181	396	399
Income (Loss) from Continuing Operations Attributable to Parent	769	647	1,487	1,439
Income (loss) from discontinued operations, net of tax	0	28	(3)	38
Undistributed income of bank subsidiaries	0	0	0	0
Undistributed income of nonbank subsidiaries	0	0	0	0
Net income (loss)	769	675	1,484	1,477
Other Comprehensive Income (Loss), Net of Tax	91	(166)	243	(119)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	860	509	1,727	1,358
Consolidation, Eliminations [Member]
Condensed Income Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	0	0	0	0
Interest on loans held-for-sale		0		0
Interest and dividends on investment securities	0	0	0	0
Interest on cash and cash equivalents	0	0	0	0
Operating leases	0	0	0	0
Total financing revenue and other interest income	(7)	(9)	(15)	(37)
Interest on deposits	0	0	0	0
Interest on short-term borrowings	0	0	0	0
Interest on long-term debt	0	0	0	0
Interest Expense, Debt	(7)	(9)	(15)	(37)
Total interest expense	(7)	(9)	(15)	(37)
Depreciation expense on operating lease assets	0	0	0	0
Net financing revenue (loss)	0	0	0	0
Bank Subsidiary		(800)		(1,050)
Nonbank subsidiaries	(148)	(248)	(629)	(486)
Insurance premiums and service revenue earned	0	0	0	0
Gain (loss) on mortgage and automotive loans, net	0	0	0	0
Loss on extinguishment of debt		0	0	0
Other gain on investments, net	0	0	0	0
Other income, net of losses	(435)	(577)	(929)	(1,177)
Total other revenue	(435)	(577)	(929)	(1,177)
Total net revenue (loss)	(583)	(1,625)	(1,558)	(2,713)
Provision for loan losses	0	0	0	0
Compensation and benefits expense	0	(100)	0	(224)
Insurance losses and loss adjustment expenses	0	0	0	0
Other operating expenses	(433)	(477)	(929)	(953)
Total noninterest expense	(433)	(577)	(929)	(1,177)
(Loss) income from continuing operations before income tax (benefit) expense and undistributed income of subsidiaries	(150)	(1,048)	(629)	(1,536)
Income tax expense (benefit) from continuing operations	0	0	0	0
Income (Loss) from Continuing Operations Attributable to Parent	(150)	(1,048)	(629)	(1,536)
Income (loss) from discontinued operations, net of tax	0	0	0	0
Undistributed income of bank subsidiaries	(672)	264	(1,214)	(96)
Undistributed income of nonbank subsidiaries	(363)	(159)	(328)	(418)
Net income (loss)	(1,185)	(943)	(2,171)	(2,050)
Other Comprehensive Income (Loss), Net of Tax	(153)	233	(388)	144
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	(1,338)	(710)	(2,559)	(1,906)
Affiliated Entity [Member]
Condensed Income Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	0	0	0	0
Interest on cash and cash equivalents	0	0	0	0
Affiliated Entity [Member] | Parent [Member]
Condensed Income Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	3	2	6	12
Interest on cash and cash equivalents	0	0	0	0
Affiliated Entity [Member] | Guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	0	0	0	0
Interest on cash and cash equivalents	0	0	0	0
Affiliated Entity [Member] | Non-Guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	2	5	4	21
Interest on cash and cash equivalents	2	2	5	4
Affiliated Entity [Member] | Consolidation, Eliminations [Member]
Condensed Income Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	(5)	(7)	(10)	(33)
Interest on cash and cash equivalents	$ (2)	$ (2)	$ (5)	$ (4)

Parent And Guarantor Consoli114

Parent And Guarantor Consolidating Financial Statements (Schedule Of Condensed Consolidating Balance Sheet) (Details) - USD ($) $ in Millions	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014
Condensed Balance Sheet Statements, Captions [Line Items]
Noninterest-bearing cash and cash equivalents	$ 1,790		$ 2,148
Interest-bearing cash and cash equivalents	3,941		4,232
Total cash and cash equivalents	5,731		6,380	$ 5,858		$ 5,576
Available-for-sale securities	18,197		17,157
Held-to-maturity securities	571		0
Loans held-for-sale, net	15		105
Finance receivables and loans, net	112,653		111,600	105,172
Loans to bank subsidiary	0		0
Loans to nonbank subsidiary	0		0
Allowance for loan losses	(1,089)	$ (1,077)	(1,054)	(974)	$ (933)	(977)
Total finance receivables and loans, net	111,564		110,546
Investment in operating leases, net	13,755		16,271
Receivables from bank subsidiary	0		0
Receivables from nonbank subsidiary	0		0
Investment in bank subsidiaries	0		0
Investment in nonbank subsidiaries	0		0
Premiums receivable and other insurance assets	1,844		1,801
Other assets	6,254		6,321
Total assets	157,931		158,581	156,278
Noninterest-bearing deposit liabilities	94		89
Interest-bearing deposit liabilities	72,708		66,389
Total deposit liabilities	72,802		66,478
Short-term borrowings	5,994		8,101
Long-term debt	61,040		66,234
Debt Payable To Nonbank Subsidiaries	0		0
Payables to Bank Subsidiaries	0		0
Payables to Nonbank Subsidiaries	0		0
Interest payable	427		350
Unearned insurance premiums and service revenue	2,465		2,434
Accrued expenses and other liabilities	1,592		1,545
Total liabilities	144,320		145,142
Total equity	13,611		13,439	14,295		15,399
Total liabilities and equity	157,931		158,581
Parent [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Noninterest-bearing cash and cash equivalents	796		1,234
Interest-bearing cash and cash equivalents	700		401
Total cash and cash equivalents	1,496		1,635	2,180		2,286
Available-for-sale securities	0		0
Held-to-maturity securities	0
Loans held-for-sale, net	0		0
Finance receivables and loans, net	3,162		2,636
Loans to bank subsidiary	1,400		600
Loans to nonbank subsidiary	2,319		3,277
Allowance for loan losses	(76)		(72)
Total finance receivables and loans, net	6,805		6,441
Investment in operating leases, net	59		81
Receivables from bank subsidiary	293		186
Receivables from nonbank subsidiary	91		259
Investment in bank subsidiaries	17,257		16,496
Investment in nonbank subsidiaries	10,837		10,902
Premiums receivable and other insurance assets	0		0
Other assets	4,537		4,785
Total assets	41,375		40,785
Noninterest-bearing deposit liabilities	0		0
Interest-bearing deposit liabilities	200		229
Total deposit liabilities	200		229
Short-term borrowings	3,576		3,453
Long-term debt	21,625		21,048
Debt Payable To Nonbank Subsidiaries	1,400		1,409
Payables to Bank Subsidiaries	203		142
Payables to Nonbank Subsidiaries	164		420
Interest payable	251		258
Unearned insurance premiums and service revenue	0		0
Accrued expenses and other liabilities	345		387
Total liabilities	27,764		27,346
Total equity	13,611		13,439
Total liabilities and equity	41,375		40,785
Guarantor Subsidiaries [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Noninterest-bearing cash and cash equivalents	0		0
Interest-bearing cash and cash equivalents	0		0
Total cash and cash equivalents	0		0	0		0
Available-for-sale securities	0		0
Held-to-maturity securities	0
Loans held-for-sale, net	0		0
Finance receivables and loans, net	0		0
Loans to bank subsidiary	0		0
Loans to nonbank subsidiary	0		0
Allowance for loan losses	0		0
Total finance receivables and loans, net	0		0
Investment in operating leases, net	0		0
Receivables from bank subsidiary	0		0
Receivables from nonbank subsidiary	0		0
Investment in bank subsidiaries	17,257		16,496
Investment in nonbank subsidiaries	1		11
Premiums receivable and other insurance assets	0		0
Other assets	0		0
Total assets	17,258		16,507
Noninterest-bearing deposit liabilities	0		0
Interest-bearing deposit liabilities	0		0
Total deposit liabilities	0		0
Short-term borrowings	0		0
Long-term debt	0		0
Debt Payable To Nonbank Subsidiaries	0		0
Payables to Bank Subsidiaries	0		0
Payables to Nonbank Subsidiaries	0		0
Interest payable	0		0
Unearned insurance premiums and service revenue	0		0
Accrued expenses and other liabilities	0		82
Total liabilities	0		82
Total equity	17,258		16,425
Total liabilities and equity	17,258		16,507
Non-Guarantor Subsidiaries [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Noninterest-bearing cash and cash equivalents	994		914
Interest-bearing cash and cash equivalents	3,241		3,831
Total cash and cash equivalents	5,074		5,595	4,422		3,905
Available-for-sale securities	18,197		17,157
Held-to-maturity securities	571
Loans held-for-sale, net	15		105
Finance receivables and loans, net	109,491		108,964
Loans to bank subsidiary	0		0
Loans to nonbank subsidiary	561		559
Allowance for loan losses	(1,013)		(982)
Total finance receivables and loans, net	109,039		108,541
Investment in operating leases, net	13,696		16,190
Receivables from bank subsidiary	0		0
Receivables from nonbank subsidiary	124		282
Investment in bank subsidiaries	0		0
Investment in nonbank subsidiaries	0		0
Premiums receivable and other insurance assets	1,868		1,827
Other assets	4,612		4,488
Total assets	153,196		154,185
Noninterest-bearing deposit liabilities	94		89
Interest-bearing deposit liabilities	72,508		66,160
Total deposit liabilities	72,602		66,249
Short-term borrowings	2,418		4,648
Long-term debt	39,415		45,186
Debt Payable To Nonbank Subsidiaries	3,719		3,877
Payables to Bank Subsidiaries	0		0
Payables to Nonbank Subsidiaries	165		191
Interest payable	176		92
Unearned insurance premiums and service revenue	2,465		2,434
Accrued expenses and other liabilities	4,142		4,028
Total liabilities	125,102		126,705
Total equity	28,094		27,480
Total liabilities and equity	153,196		154,185
Consolidation, Eliminations [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Noninterest-bearing cash and cash equivalents	0		0
Interest-bearing cash and cash equivalents	0		0
Total cash and cash equivalents	(839)		(850)	$ (744)		$ (615)
Available-for-sale securities	0		0
Held-to-maturity securities	0
Loans held-for-sale, net	0		0
Finance receivables and loans, net	0		0
Loans to bank subsidiary	(1,400)		(600)
Loans to nonbank subsidiary	(2,880)		(3,836)
Allowance for loan losses	0		0
Total finance receivables and loans, net	(4,280)		(4,436)
Investment in operating leases, net	0		0
Receivables from bank subsidiary	(293)		(186)
Receivables from nonbank subsidiary	(215)		(541)
Investment in bank subsidiaries	(34,514)		(32,992)
Investment in nonbank subsidiaries	(10,838)		(10,913)
Premiums receivable and other insurance assets	(24)		(26)
Other assets	(2,895)		(2,952)
Total assets	(53,898)		(52,896)
Noninterest-bearing deposit liabilities	0		0
Interest-bearing deposit liabilities	0		0
Total deposit liabilities	0		0
Short-term borrowings	0		0
Long-term debt	0		0
Debt Payable To Nonbank Subsidiaries	(5,119)		(5,286)
Payables to Bank Subsidiaries	(203)		(142)
Payables to Nonbank Subsidiaries	(329)		(611)
Interest payable	0		0
Unearned insurance premiums and service revenue	0		0
Accrued expenses and other liabilities	(2,895)		(2,952)
Total liabilities	(8,546)		(8,991)
Total equity	(45,352)		(43,905)
Total liabilities and equity	(53,898)		(52,896)
Affiliated Entity [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Interest-bearing cash and cash equivalents	0		0
Affiliated Entity [Member] | Parent [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Interest-bearing cash and cash equivalents	0		0
Affiliated Entity [Member] | Guarantor Subsidiaries [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Interest-bearing cash and cash equivalents	0		0
Affiliated Entity [Member] | Non-Guarantor Subsidiaries [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Interest-bearing cash and cash equivalents	839		850
Affiliated Entity [Member] | Consolidation, Eliminations [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Interest-bearing cash and cash equivalents	$ (839)		$ (850)

Parent And Guarantor Consoli115

Parent And Guarantor Consolidating Financial Statements (Schedule Of Condensed Consolidating Statement of Cash Flow) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	$ 2,422	$ 1,743
Purchases of available-for-sale securities	(8,657)	(8,165)
Proceeds from sales of available-for-sale securities	6,584	2,865
Proceeds from maturities and repayment of available-for-sale securities	1,536	2,192
Purchases of held-to-maturity securities	(571)	0
Net (increase) decrease in finance receivables and loans	(5,653)	(5,471)
Proceeds from Sale of Loans Held-for-sale	4,156	1,582
Purchases of operating lease assets	(1,472)	(2,348)
Disposals of operating lease assets	3,047	2,709
Payments to Acquire Interest in Subsidiaries and Affiliates	(288)	0
Capital contributions to subsidiaries	0	0
Returns of contributed capital	0	0
Proceeds from sale of business units, net	0	1,049
Increase (Decrease) in Restricted Cash	482	449
Net change in nonmarketable equity investments	(354)	88
Other, net	(69)	(142)
Net cash provided by investing activities	(1,259)	(5,192)
Net change in short-term borrowings	(2,112)	2,945
Net increase in bank deposits	6,308	3,713
Proceeds from issuance of long-term debt	9,020	17,818
Repayments of long-term debt	(14,305)	(18,984)
Net Change in Debt, Intercompany	0	0
Repurchase and Redemption of Preferred Stock	(696)	(442)
Dividends paid on preferred stock	(30)	(1,318)
Dividends paid and returns of contributed capital, Intercompany	0	0
Capital contributions from parent	0	0
Net cash (used in) provided by financing activities	(1,815)	3,732
Effect of exchange-rate changes on cash and cash equivalents	3	(1)
Net (decrease) increase in cash and cash equivalents	(649)	282
Cash and cash equivalents at beginning of period	6,380	5,576
Cash and cash equivalents at end of period	5,731	5,858
Parent [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	132	(64)
Purchases of available-for-sale securities	0	0
Proceeds from sales of available-for-sale securities	0	0
Proceeds from maturities and repayment of available-for-sale securities	0	0
Purchases of held-to-maturity securities	0
Net (increase) decrease in finance receivables and loans	(834)	787
Proceeds from Sale of Loans Held-for-sale	0	0
Purchases of operating lease assets	0	0
Disposals of operating lease assets	9	0
Payments to Acquire Interest in Subsidiaries and Affiliates	(288)
Capital contributions to subsidiaries	(988)	(169)
Returns of contributed capital	1,971	602
Proceeds from sale of business units, net		1,049
Increase (Decrease) in Restricted Cash	1	0
Net change in nonmarketable equity investments	0	0
Other, net	(82)	(10)
Net cash provided by investing activities	(150)	4,857
Net change in short-term borrowings	123	121
Net increase in bank deposits	(29)	(72)
Proceeds from issuance of long-term debt	1,115	3,780
Repayments of long-term debt	(596)	(5,837)
Net Change in Debt, Intercompany	(8)	(1,131)
Repurchase and Redemption of Preferred Stock	(696)	(442)
Dividends paid on preferred stock	(30)	(1,318)
Dividends paid and returns of contributed capital, Intercompany	0	0
Capital contributions from parent	0	0
Net cash (used in) provided by financing activities	(121)	(4,899)
Effect of exchange-rate changes on cash and cash equivalents	0	0
Net (decrease) increase in cash and cash equivalents	(139)	(106)
Cash and cash equivalents at beginning of period	1,635	2,286
Cash and cash equivalents at end of period	1,496	2,180
Guarantor Subsidiaries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	0	525
Purchases of available-for-sale securities	0	0
Proceeds from sales of available-for-sale securities	0	0
Proceeds from maturities and repayment of available-for-sale securities	0	0
Purchases of held-to-maturity securities	0
Net (increase) decrease in finance receivables and loans	0	0
Proceeds from Sale of Loans Held-for-sale	0	0
Purchases of operating lease assets	0	0
Disposals of operating lease assets	0	0
Payments to Acquire Interest in Subsidiaries and Affiliates	0
Capital contributions to subsidiaries	0	(1)
Returns of contributed capital	8	0
Proceeds from sale of business units, net		0
Increase (Decrease) in Restricted Cash	0	0
Net change in nonmarketable equity investments	0	0
Other, net	0	0
Net cash provided by investing activities	8	(1)
Net change in short-term borrowings	0	0
Net increase in bank deposits	0	0
Proceeds from issuance of long-term debt	0	0
Repayments of long-term debt	0	0
Net Change in Debt, Intercompany	0	0
Repurchase and Redemption of Preferred Stock	0	0
Dividends paid on preferred stock	0	0
Dividends paid and returns of contributed capital, Intercompany	(8)	(525)
Capital contributions from parent	0	1
Net cash (used in) provided by financing activities	(8)	(524)
Effect of exchange-rate changes on cash and cash equivalents	0	0
Net (decrease) increase in cash and cash equivalents	0	0
Cash and cash equivalents at beginning of period	0	0
Cash and cash equivalents at end of period	0	0
Non-Guarantor Subsidiaries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	2,919	2,817
Purchases of available-for-sale securities	(8,657)	(8,165)
Proceeds from sales of available-for-sale securities	6,584	2,865
Proceeds from maturities and repayment of available-for-sale securities	1,536	2,192
Purchases of held-to-maturity securities	(571)
Net (increase) decrease in finance receivables and loans	(4,819)	(6,258)
Proceeds from Sale of Loans Held-for-sale	4,156	1,582
Purchases of operating lease assets	(1,472)	(2,348)
Disposals of operating lease assets	3,038	(2,709)
Payments to Acquire Interest in Subsidiaries and Affiliates	0
Capital contributions to subsidiaries	0	1
Returns of contributed capital	0	0
Proceeds from sale of business units, net		0
Increase (Decrease) in Restricted Cash	481	449
Net change in nonmarketable equity investments	(354)	88
Other, net	13	(132)
Net cash provided by investing activities	(67)	(5,758)
Net change in short-term borrowings	(2,235)	2,824
Net increase in bank deposits	6,337	3,785
Proceeds from issuance of long-term debt	7,905	14,038
Repayments of long-term debt	(13,709)	(13,147)
Net Change in Debt, Intercompany	(62)	(2,597)
Repurchase and Redemption of Preferred Stock	0	0
Dividends paid on preferred stock	0	0
Dividends paid and returns of contributed capital, Intercompany	(2,600)	(1,612)
Capital contributions from parent	988	168
Net cash (used in) provided by financing activities	(3,376)	3,459
Effect of exchange-rate changes on cash and cash equivalents	3	(1)
Net (decrease) increase in cash and cash equivalents	(521)	517
Cash and cash equivalents at beginning of period	5,595	3,905
Cash and cash equivalents at end of period	5,074	4,422
Consolidation, Eliminations [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	(629)	(1,535)
Purchases of available-for-sale securities	0	0
Proceeds from sales of available-for-sale securities	0	0
Proceeds from maturities and repayment of available-for-sale securities	0	0
Purchases of held-to-maturity securities	0
Net (increase) decrease in finance receivables and loans	0	0
Proceeds from Sale of Loans Held-for-sale	0	0
Purchases of operating lease assets	0	0
Disposals of operating lease assets	0	0
Payments to Acquire Interest in Subsidiaries and Affiliates	0
Capital contributions to subsidiaries	988	169
Returns of contributed capital	(1,979)	(602)
Proceeds from sale of business units, net		0
Increase (Decrease) in Restricted Cash	0	0
Net change in nonmarketable equity investments	0	0
Other, net	0	0
Net cash provided by investing activities	(1,050)	(4,290)
Net change in short-term borrowings	0	0
Net increase in bank deposits	0	0
Proceeds from issuance of long-term debt	0	0
Repayments of long-term debt	0	0
Net Change in Debt, Intercompany	70	3,728
Repurchase and Redemption of Preferred Stock	0	0
Dividends paid on preferred stock	0	0
Dividends paid and returns of contributed capital, Intercompany	2,608	2,137
Capital contributions from parent	(988)	(169)
Net cash (used in) provided by financing activities	1,690	5,696
Effect of exchange-rate changes on cash and cash equivalents	0	0
Net (decrease) increase in cash and cash equivalents	11	(129)
Cash and cash equivalents at beginning of period	(850)	(615)
Cash and cash equivalents at end of period	(839)	(744)
Affiliated Entity [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net (increase) decrease in finance receivables and loans	0	0
Affiliated Entity [Member] | Parent [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net (increase) decrease in finance receivables and loans	61	2,598
Affiliated Entity [Member] | Guarantor Subsidiaries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net (increase) decrease in finance receivables and loans	0	0
Affiliated Entity [Member] | Non-Guarantor Subsidiaries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net (increase) decrease in finance receivables and loans	(2)	1,259
Affiliated Entity [Member] | Consolidation, Eliminations [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net (increase) decrease in finance receivables and loans	$ (59)	$ (3,857)

Subsequent Events (Details)

Subsequent Events (Details)	6 Months Ended
	Jun. 30, 2016USD ($)
Subsequent Event [Line Items]
Dividends	$ 0.08
Stock Repurchase Program, Authorized Amount	$ 700,000,000